If you want EASY to hack keyboards then hit up the thrift stores/surplus places and look for "clicky" keyboards. Specifically look for heavy keyboards that make a nice click with each keypress.
These are an absolute dream to work with. They will have a full size PCB inside that will let you easily select the exact keys you want to use, and then even put the thing back together afterwards.
I have used these several times, and never had a problem with them.
One note though, I DO NOT suggest using a keyboard for a multi-player control panel. Use them for single player ones only, no chance of blocking that way.