I just stumbled across this thread today, and have just recently completed this same kind of process with DB25s so that my new custom sticks will be able to be swapped between Happ Competition, Happ Super, and Sanwa Octo Gate and Sanwa Square Gate panels. The whole reason I am on the forum right now is researching where I went wrong wiring up my CHIMP SMD to it.
Regardless the harness worked fine. I have the wiring zip tied to the panel and base of the stick to decrease wear on the wires, when switching panels. I definitely recommend going this route though.
Simple math and all, unplugging and replugging one cable instead of 15 per time…