Use IDesignEditor for designs.

Glamourer/Designs/IDesignEditor.cs

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+using Glamourer.Designs.Links;
+using Glamourer.GameData;
+using Glamourer.State;
+using Penumbra.GameData.Enums;
+using Penumbra.GameData.Structs;
+
+namespace Glamourer.Designs;
+
+public readonly record struct ApplySettings(
+    uint Key = 0,
+    StateSource Source = StateSource.Manual,
+    bool RespectManual = false,
+    bool FromJobChange = false,
+    bool UseSingleSource = false);
+
+public interface IDesignEditor
+{
+    /// <summary> Change a customization value. </summary>
+    public void ChangeCustomize(object data, CustomizeIndex idx, CustomizeValue value, ApplySettings settings = default);
+
+    /// <summary> Change an entire customize array according to the given flags. </summary>
+    public void ChangeEntireCustomize(object data, in CustomizeArray customizeInput, CustomizeFlag apply, ApplySettings settings = default);
+
+    /// <summary> Change a customize parameter. </summary>
+    public void ChangeCustomizeParameter(object data, CustomizeParameterFlag flag, CustomizeParameterValue v, ApplySettings settings = default);
+
+    /// <summary> Change an equipment piece. </summary>
+    public void ChangeItem(object data, EquipSlot slot, EquipItem item, ApplySettings settings = default)
+        => ChangeEquip(data, slot, item, null, settings);
+
+    /// <summary> Change the stain for any equipment piece. </summary>
+    public void ChangeStain(object data, EquipSlot slot, StainId stain, ApplySettings settings = default)
+        => ChangeEquip(data, slot, null, stain, settings);
+
+    /// <summary> Change an equipment piece and its stain at the same time. </summary>
+    public void ChangeEquip(object data, EquipSlot slot, EquipItem? item, StainId? stain, ApplySettings settings = default);
+
+    /// <summary> Change the crest visibility for any equipment piece. </summary>
+    public void ChangeCrest(object data, CrestFlag slot, bool crest, ApplySettings settings = default);
+
+    /// <summary> Change the bool value of one of the meta flags. </summary>
+    public void ChangeMetaState(object data, MetaIndex slot, bool value, ApplySettings settings = default);
+
+    /// <summary> Change all values applies from the given design. </summary>
+    public void ApplyDesign(object data, MergedDesign design, ApplySettings settings = default);
+
+    /// <summary> Change all values applies from the given design. </summary>
+    public void ApplyDesign(object data, DesignBase design, ApplySettings settings = default);
+}