It was just a bad idea. I don’t think it can be salvaged. I don’t see how they would fix the vault without it being OP. The alternative is picking one of your worst slots for upgrade to the iLvl you opened but that seems too far in the opposite direction of handing out charity gear.
Grinding currency for gear isn’t my favorite system because vendor gear is soulless. However, it offers a concrete path to fix stubborn slots where you’ve gotten endlessly screwed by RNG.