If a crank isn't suitable then maybe this is the right thing you need to manually apply torque to an axle.
Very simple and minimalistic.
Some from function elegance here.
The*.stl is 78mm in diameter without the knobs (for big hands).
Adjust it to your liking in the* .scad
Category: Parts
The author marked this model as their own original creation. Imported from Thingiverse.