For balance reasons I reduced the number of Hand and Shoes slots down to 1 so players can only wear one Relic in those slots. But now if you don't hide those slots the items only render on 1 hand or foot. Is it somehw possible to get it to render the items on both hands or feet?

Yes, we plan to make it so that if a glove or boot is equipped as a single item, it will be rendered on both hands/feet.