I've been watching his site, I've bought a few items from him before, good quality. His PC Engine controller adapters work on TG16 pads, but only come in the PC Engine plug format.. still a good find.
I might end up installing a big throw switch that comes out the top of the system, or molding my own with a hardening plumber's putty. That might be the easiest way, but it still has some flex in it when it cures.