At one point, I made a paddle for my rig;
I cut a piece of wood in a sort of wedge shape and and took the rubber off the foot peg. A "U" bracket under the smaller end attached the wood paddle to the peg so it would be hinged. On top, towards the front, was a noose. I put my cast through the noose and when I jekrd my whole foot up, I shifted up. When I pressed down on the paddle, I shifted down.
Teak wood with red "Royal Enfield" marquetry would be a nice touch?
Hey- it worked while I had a cast (9 months).