The cast (especially Maid!Felicia, and also FE13 Anna if you extend it to her) would probably be pretty happy with you if you treated the magic weapons as non-elemental, and given that elements aren't actually a thing in this game (even less than most FEs, there's no "magic triangle" and no element-based weakness hitting like Tellius/Awakening) if you want to vote that way there's really no evidence to argue against it besides flavour.
It's even weirder in Fates than most because you get all the "spirits" (Hoshido magic) which are the equivalent to tomes but have no elements associated with them, just an animal and colour.