Broken Key Desperately Needs A Separate Model
The broken key, conceptually, is one of my favorite items because of its addons. The ability to see the killer in a jungle gym loop is incredibly helpful, and seeing survivors is good for indoor maps where it's hard to find unfinished generators.
The problem with this item is that it's visually indistinguishable from the best item in the game, and killers are exponentially more likely to equip their best perks and try to take you out of the game as quickly as possible just to remove that potential item from play.
The only way the broken key can get significant use without being a complete double-edged sword is for it to have a distinct model. Even so much as a recolor would be sufficient, but it's not worth the risk to yourself in its current state.