[Slydria]

I feel like this isn't really feasible then.

Either you'd have to carry around bags of unrefined metal everywhere, which while isn't impossible, it is frankly silly and unwieldy. Or it'd be way too situational as there's no way most surface level locations would have the quantity of metal material to do the things you're trying to accomplish (or you'd have a level of magnetism that's way too reaching and powerful to permit.)

I think it would be better to consider alternatives, such as trying to train your character to learn Geomancy from someone else or if they have absolutely no ability to do so then consider making a new character to facilitate this and do something else with this one.