diff --git a/docs/pre_processing_fields.md b/docs/pre_processing_fields.md
index f13eb81..f8efb50 100644
--- a/docs/pre_processing_fields.md
+++ b/docs/pre_processing_fields.md
@@ -33,6 +33,22 @@ current time:
   end
 ```
 
+Keyword parameters passed to the `amoeba_dup` command can also be used:
+
+```ruby
+  amoeba do
+    set string_field: ->(str_arg:) { str_arg }
+    set integer_field: ->(int_arg:) { int_arg }
+    set combined_field: ->(str_arg:, int_arg: 33, other_arg: 'default') { "#{str_arg} - #{int_arg} - #{other_arg}" }
+  end
+
+new_item = item.amoeba_dup(str_arg: 'new string', int_arg: 45)
+# => new_item.string_field = 'new_string'
+# => new_item.integer_field = 99
+# => new_item.combined_field = 'new_string - 99 - default'
+```
+
+
 ## regex
 
 To do
diff --git a/lib/amoeba/cloner.rb b/lib/amoeba/cloner.rb
index b8c344d..6dc1a47 100644
--- a/lib/amoeba/cloner.rb
+++ b/lib/amoeba/cloner.rb
@@ -13,9 +13,9 @@ class Cloner
 
     def_delegators :object_klass, :amoeba, :fresh_amoeba, :reset_amoeba
 
-    def initialize(object, options = {})
+    def initialize(object, **kwargs)
       @old_object = object
-      @options    = options
+      @params = kwargs
       @object_klass = @old_object.class
       inherit_parent_settings
       @new_object = object.__send__(amoeba.dup_method)
@@ -135,7 +135,12 @@ def process_null_fields
     def process_coercions
       # prepend any extra strings to indicate uniqueness of the new record(s)
       amoeba.coercions.each do |field, coercion|
-        @new_object[field] = coercion.is_a?(Proc) ? coercion.call : coercion.to_s
+        if coercion.is_a?(Proc)
+          keys = coercion.parameters.select { |pair| %i[key keyreq].include?(pair.first) }.map(&:second)
+          @new_object[field] = coercion.call(**@params.slice(*keys))
+        else
+          @new_object[field] = coercion.to_s
+        end
       end
     end
 
diff --git a/lib/amoeba/instance_methods.rb b/lib/amoeba/instance_methods.rb
index 1be2592..e1d079c 100644
--- a/lib/amoeba/instance_methods.rb
+++ b/lib/amoeba/instance_methods.rb
@@ -33,8 +33,8 @@ def _parent_amoeba_settings
       end
     end
 
-    def amoeba_dup(options = {})
-      ::Amoeba::Cloner.new(self, options).run
+    def amoeba_dup(**kwargs)
+      ::Amoeba::Cloner.new(self, **kwargs).run
     end
   end
 end
diff --git a/lib/amoeba/macros/has_many.rb b/lib/amoeba/macros/has_many.rb
index 3269b6b..0cb5923 100644
--- a/lib/amoeba/macros/has_many.rb
+++ b/lib/amoeba/macros/has_many.rb
@@ -32,7 +32,7 @@ def follow_without_clone(relation_name, association)
         return if association.is_a?(ActiveRecord::Reflection::ThroughReflection)
 
         @old_object.__send__(relation_name).each do |old_obj|
-          copy_of_obj = old_obj.amoeba_dup(@options)
+          copy_of_obj = old_obj.amoeba_dup
           copy_of_obj[:"#{association.foreign_key}"] = nil
           relation_name = remapped_relation_name(relation_name)
           # associate this new child to the new parent object
diff --git a/lib/amoeba/macros/has_one.rb b/lib/amoeba/macros/has_one.rb
index 6ae2e24..b08babf 100644
--- a/lib/amoeba/macros/has_one.rb
+++ b/lib/amoeba/macros/has_one.rb
@@ -9,7 +9,7 @@ def follow(relation_name, association)
         old_obj = @old_object.__send__(relation_name)
         return unless old_obj
 
-        copy_of_obj = old_obj.amoeba_dup(@options)
+        copy_of_obj = old_obj.amoeba_dup
         copy_of_obj[:"#{association.foreign_key}"] = nil
         relation_name = remapped_relation_name(relation_name)
         @new_object.__send__(:"#{relation_name}=", copy_of_obj)
diff --git a/spec/lib/amoeba/class_methods_spec.rb b/spec/lib/amoeba/class_methods_spec.rb
index 4344ec7..55d6ebe 100644
--- a/spec/lib/amoeba/class_methods_spec.rb
+++ b/spec/lib/amoeba/class_methods_spec.rb
@@ -4,8 +4,9 @@
 
 RSpec.describe Amoeba::ClassMethods do
   describe '#amoeba' do
-    let(:dup) { test.amoeba_dup }
-    let(:test) { TestModel.new(**params) }
+    let(:dup) { original.amoeba_dup(**dup_params) }
+    # let(:test) { TestModel.new(**params) }
+    let(:dup_params) { {} }
 
     before do
       stub_const 'TestModel', Class.new(ActiveRecord::Base)
@@ -22,7 +23,7 @@
 
     describe 'set' do
       context 'with a static string value' do
-        let(:params) { { test_field: 'original string' } }
+        let(:original) { TestModel.new(test_field: 'original string') }
         let(:field_type) { :string }
         let(:config) do
           <<~CONFIG
@@ -36,7 +37,7 @@
       end
 
       context 'with a static integer value' do
-        let(:params) { { test_field: 33 } }
+        let(:original) { TestModel.new(test_field: 33) }
         let(:field_type) { :integer }
         let(:config) do
           <<~CONFIG
@@ -50,7 +51,7 @@
       end
 
       context 'with a static boolean value' do
-        let(:params) { { test_field: true } }
+        let(:original) { TestModel.new(test_field: true) }
         let(:field_type) { :boolean }
         let(:config) do
           <<~CONFIG
@@ -64,7 +65,7 @@
       end
 
       context 'with a datetime field set by a lambda' do
-        let(:params) { { test_field: DateTime.parse('30 Jun 2024 18:19') } }
+        let(:original) { TestModel.new(test_field: DateTime.parse('30 Jun 2024 18:19')) }
         let(:field_type) { :datetime }
         let(:config) do
           <<~CONFIG
@@ -79,6 +80,45 @@
 
         it { expect(dup.test_field).to eq(DateTime.parse('1 Jul 2024 09:35')) }
       end
+
+      context 'with a field set by a parameter' do
+        let(:original) { TestModel.new(test_field: 'original string') }
+        let(:dup_params) { { str_arg: 'new string arg' } }
+        let(:field_type) { :string }
+        let(:config) do
+          <<~CONFIG
+            amoeba do
+              set test_field: ->(str_arg:) { ">> \#{str_arg} <<" }
+            end
+          CONFIG
+        end
+
+        it { expect(dup.test_field).to eq('>> new string arg <<') }
+      end
+
+      context 'with fields set by different parameters' do
+        let(:original) { TestModel.new(test_field: 'original string', second_test_field: 33, third_test_field: '') }
+        let(:dup_params) { { str_arg: 'new string arg', int_arg: 99 } }
+        let(:field_type) { :string }
+        let(:config) do
+          <<~CONFIG
+            amoeba do
+              set test_field: ->(str_arg:) { ">> \#{str_arg} <<" }
+              set second_test_field: ->(int_arg:) { int_arg * 2 }
+              set third_test_field: ->(str_arg:, int_arg: 33, other_arg: 'default') { "\#{str_arg} - \#{int_arg} - default" }
+            end
+          CONFIG
+        end
+
+        before do
+          ActiveRecord::Base.connection.add_column :test_models, :second_test_field, :integer
+          ActiveRecord::Base.connection.add_column :test_models, :third_test_field, :string
+        end
+
+        it { expect(dup.test_field).to eq('>> new string arg <<') }
+        it { expect(dup.second_test_field).to eq(198) }
+        it { expect(dup.third_test_field).to eq('new string arg - 99 - default') }
+      end
     end
   end
 end