I did that in my cab. I got a pull-chain switch, normally used for lamps on the ceiling, and I love it. I open the coin door, reach inside and pull the cord, and it toggles.
It did require getting a little piece of metal to mount it in, but you should be able to find a little corner-bracket with the right size hole. If not, use a sturdy drillbit and drop some oil on where you're drilling, and you can go through metal pretty nicely. (that's what I did.)