Would any of you clever engineering types like to comment on the possibility of cranks drilled with three sockets, and one pair of QR pedals? Sounds like it has potential for quick changes of ‘gearing’.
Those cranks glut mentioned can be used, you would just have to use 2 left cranks. i think you need a…helicoil? to do this. My 24 inch yuni muni has 2 left cranks on it, it actually came that way, as all the yuni munis do.