Let’s assume a Feruchemist has access to some other form of Investiture, maybe with a Perpendicularity, liquid Dor, becoming a Radiant, getting Breaths, or maybe even tapping Connection to become Elantrian or something. We’ve seen from TLM that Allomancers can use Investiture from a Perpendicularity instead of metals, so can Feruchemists do the same? If so, how would something like a coppermind work, where the attribute has data stored rather than just an amount? There’s probably a WoB explaining this somewhere, but I can’t find it.