Thanks.
I'll try that setup.
One thing I should point out, though, is that, while the Ghost Touch Weapon Item power is only supposed to be used on magic weapons, applying it to any other item allows an incorporeal creature to use it without triggering a validation error. Frumple's Adjustments from the Community GM Pack showed me that, and it actually works. Using my script, when the amulet is not equipped an item like a headband has a validation error, but when you equip it, the error goes away. I can still use the BaseWep approach for how the amulet functions if the character is corporeal.
As for the subtype, what you're looking for would be
Code:
doneif (#hassubtype[stIncorpor] = 1)