I used to work in a shared building with a guy who lost his right leg just above the knee. Says he can't stand to wear a prosthetic leg so he get around on crutches. Sooo his missed riding his Harley and on his own, plumbed the breaks all into one right hand break grip. Installed a wheel on an actuator and has the switch hidden so you can't see it. The Wheel on the actuator allows him to lean the bike over far enough to get his nub leg over the bike, flip the kickstand up on the right side and ride off. He also made a holster to stick his crutches in.
Oh and the best part of it all his license plate says ONELEG on it LOL