Forcing masterwork for an item power

[frumple]

I am working on a set of item powers that doesn't require the base weapon to be enchanted, but does force the item to be masterwork. So in the individual item powers I have the Non-magical effect checkbox checked (so the item doesn't need to have a magic bonus), but I need the equivalent of the tag Helper.MatForceMs for materials so I can force masterwork. Is there such a tag? If not, ideas on how I can achieve this?