So instead of altering your shield altogether to match a specific element, it's inherently built in. It's 1 method. It's trade offs would be different. Take away from one resistance to add to another or just make add a little bit of resistance to all elements. This method is simpler and easier to implement in the game's current state.

Seems good to me. So one could wear a titan mark with increased solar resistance. Or a warlock bond with arc resistance. For balancing it shouldn't work in crucible. Bonds, marks, and cloaks are getting bonuses in TTK anyway this would be a pretty cool addition.