I use hunt-and-peck and vimium for navigating websites and desktop windows. They weren't created for people with disabilities but they work well with my dictati

I use hunt-and-peck and vimium for navigating websites and desktop windows. They weren't created for people with disabilities but they work well with my dictation software (Talon) so I can work when my arms fail on me. Talon might also be worth your time. Since you're able-bodied you'd find it inferior to keyboards for most things, but it's a very hackable way to interact without using your hands. Combined with a screen reader you'd be all set for using a computer while biking.