Several older farm tractors have foot-operated switches that would be suitable for floor mounting with a fake stomper pedal and rubber boot adapted to the top of the switch. One of the members here posted a picture of that type of conversion that looked to be pretty simple and it was hard to tell it was not the original stomp start system.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!