I tried to make Signature Gear into a staged system, based on Wealth:
http://westmarchsaga.wikia.com/wiki/Signature_Gear
Fixing some of the vagaries of Signature Gear doesn't do anything to address my many issues withe the GURPS Magic enchantment system. Part of the point of Enchantment Through Deeds is to get away from those vagaries without coming up with a system as complicated as Enchanted Items in Sorcery.