pi to chamma is what you are after then!
I've never actually seen a solution off the shelf that runs 6 buttons on the harness. I have modified the jpacs in my homebrews to act that way to match my cab wiring.
I've not yet modded my ArcadeForge pi2jamma to do that so it's 5 buttons on the edge wierdly.. I got as far as marking the score line for splitting the final ground pin on the edge to split it off
