diff --git a/oxide/helpers.go b/oxide/helpers.go
index 3a7da1d..3ef6f68 100644
--- a/oxide/helpers.go
+++ b/oxide/helpers.go
@@ -4,8 +4,13 @@
 
 package oxide
 
+// This file contains hand-written helper methods for generated types.
+
 import "fmt"
 
+// String helpers for oneOf types whose variants are all string or string-like (Name, NameOrId,
+// etc.).
+
 // String returns the string representation of the RouteDestination's value.
 // Returns an empty string if no variant is set.
 func (v RouteDestination) String() string {
@@ -93,3 +98,97 @@ func (v RouteTarget) String() string {
 		panic(fmt.Sprintf("unhandled RouteTarget variant: %T", val))
 	}
 }
+
+// Constructor helpers for oneOf types whose variants are all string or string-like.
+
+// NewRouteDestination creates a RouteDestination from a type constant and string value.
+func NewRouteDestination(t RouteDestinationType, value string) (RouteDestination, error) {
+	switch t {
+	case RouteDestinationTypeIp:
+		return RouteDestination{Value: &RouteDestinationIp{Value: value}}, nil
+	case RouteDestinationTypeIpNet:
+		return RouteDestination{Value: &RouteDestinationIpNet{Value: IpNet(value)}}, nil
+	case RouteDestinationTypeVpc:
+		return RouteDestination{Value: &RouteDestinationVpc{Value: Name(value)}}, nil
+	case RouteDestinationTypeSubnet:
+		return RouteDestination{Value: &RouteDestinationSubnet{Value: Name(value)}}, nil
+	default:
+		return RouteDestination{}, fmt.Errorf("unknown RouteDestinationType: %s", t)
+	}
+}
+
+// NewRouteTarget creates a RouteTarget from a type constant and string value.
+// For RouteTargetTypeDrop, the value is ignored.
+func NewRouteTarget(t RouteTargetType, value string) (RouteTarget, error) {
+	switch t {
+	case RouteTargetTypeIp:
+		return RouteTarget{Value: &RouteTargetIp{Value: value}}, nil
+	case RouteTargetTypeVpc:
+		return RouteTarget{Value: &RouteTargetVpc{Value: Name(value)}}, nil
+	case RouteTargetTypeSubnet:
+		return RouteTarget{Value: &RouteTargetSubnet{Value: Name(value)}}, nil
+	case RouteTargetTypeInstance:
+		return RouteTarget{Value: &RouteTargetInstance{Value: Name(value)}}, nil
+	case RouteTargetTypeInternetGateway:
+		return RouteTarget{Value: &RouteTargetInternetGateway{Value: Name(value)}}, nil
+	case RouteTargetTypeDrop:
+		return RouteTarget{Value: &RouteTargetDrop{}}, nil
+	default:
+		return RouteTarget{}, fmt.Errorf("unknown RouteTargetType: %s", t)
+	}
+}
+
+// NewVpcFirewallRuleHostFilter creates a VpcFirewallRuleHostFilter from a type
+// constant and string value.
+func NewVpcFirewallRuleHostFilter(
+	t VpcFirewallRuleHostFilterType,
+	value string,
+) (VpcFirewallRuleHostFilter, error) {
+	switch t {
+	case VpcFirewallRuleHostFilterTypeVpc:
+		return VpcFirewallRuleHostFilter{
+			Value: &VpcFirewallRuleHostFilterVpc{Value: Name(value)},
+		}, nil
+	case VpcFirewallRuleHostFilterTypeSubnet:
+		return VpcFirewallRuleHostFilter{
+			Value: &VpcFirewallRuleHostFilterSubnet{Value: Name(value)},
+		}, nil
+	case VpcFirewallRuleHostFilterTypeInstance:
+		return VpcFirewallRuleHostFilter{
+			Value: &VpcFirewallRuleHostFilterInstance{Value: Name(value)},
+		}, nil
+	case VpcFirewallRuleHostFilterTypeIp:
+		return VpcFirewallRuleHostFilter{Value: &VpcFirewallRuleHostFilterIp{Value: value}}, nil
+	case VpcFirewallRuleHostFilterTypeIpNet:
+		return VpcFirewallRuleHostFilter{
+			Value: &VpcFirewallRuleHostFilterIpNet{Value: IpNet(value)},
+		}, nil
+	default:
+		return VpcFirewallRuleHostFilter{}, fmt.Errorf(
+			"unknown VpcFirewallRuleHostFilterType: %s",
+			t,
+		)
+	}
+}
+
+// NewVpcFirewallRuleTarget creates a VpcFirewallRuleTarget from a type constant
+// and string value.
+func NewVpcFirewallRuleTarget(
+	t VpcFirewallRuleTargetType,
+	value string,
+) (VpcFirewallRuleTarget, error) {
+	switch t {
+	case VpcFirewallRuleTargetTypeVpc:
+		return VpcFirewallRuleTarget{Value: &VpcFirewallRuleTargetVpc{Value: Name(value)}}, nil
+	case VpcFirewallRuleTargetTypeSubnet:
+		return VpcFirewallRuleTarget{Value: &VpcFirewallRuleTargetSubnet{Value: Name(value)}}, nil
+	case VpcFirewallRuleTargetTypeInstance:
+		return VpcFirewallRuleTarget{Value: &VpcFirewallRuleTargetInstance{Value: Name(value)}}, nil
+	case VpcFirewallRuleTargetTypeIp:
+		return VpcFirewallRuleTarget{Value: &VpcFirewallRuleTargetIp{Value: value}}, nil
+	case VpcFirewallRuleTargetTypeIpNet:
+		return VpcFirewallRuleTarget{Value: &VpcFirewallRuleTargetIpNet{Value: IpNet(value)}}, nil
+	default:
+		return VpcFirewallRuleTarget{}, fmt.Errorf("unknown VpcFirewallRuleTargetType: %s", t)
+	}
+}