Need help adding a dictionary term in Blender

Been working on an addon for texture paint mode. Part of the addon let’s you hold down Shift to erase on your paint layer by temporarily switching the blend mode to “Erase Alpha”. When this happens, the color selectors disappear and it looks really bad. Blender’s code hides the color selectors when using the brush blend modes, “Erase” or “Add” alpha. So I was wondering if I could just add a dictionary term to Blender’s brush blend modes which copy the function of “Erase Alpha” completely with just a different name so I can reference that in my code instead.

• How would I access the dictionary containing the brush blend modes?
• How could I add a new term that copies “Erase Alpha”?

{e.identifier: (e.name, e.description) for e in bpy.types.Brush.bl_rna.properties['blend'].enum_items}

You can’t add new items to the enum, it is built-in.

I see. Thanks.