Silver, while we don't know the exact mechanics of the prosthetics in question, the mechanics of the one shown earlier in this thread for motorcycles
is shown online.
It's basically a quick disconnect. It doesn't specify the amount of force needed to pop the ball out of the socket so I'm not sure if the good hand is needed to assist the detachment or if it's easy enough to just lift and pop it out. It says the amount of force is user adjustable.
Theoretically if one had the brackets mounted on all the necessary controls one could just pop from one to another.
From the web site:
. Adjusting the device
As you can see, the device is comprised of a ball on the end of the prosthesis and a socket mounted on the handlebar. The device releases the ball from the socket when the force applied by the ball to the socket exceeds the threshold of the detent plunger set by the user. This threshold is modulated by setting the detent springs in the socket, and by varying the length of the shaft of the ball. When adjusting the detent springs keep in mind that they should be at least tight enough to avoid any up-and-down free play, but not so tight as to create drag on the assembly.