I can see that I have not yet recommended Toyota #O hose. They sell two lengths, and the longer one is cheaper! (?). Yeah, I use model airplane fuel line for some stuff, and no - it is not impervious. I replace it at 3 year intervals, because it stiffens. Toyota hose doesn’t do that.
Also worth noting - the longer the worm shaft, the less you need to worry about torque wrap-up. And you do know a can motor can be attached with aircraft safety wire? A piece of old inner tube can cushion it.