Maybe learn to use a large trackball with your feet?

Something like X-Keys L-Trac (Formerly CST2545-5w)

I've developed carpal tunnel, and to mitigate my problems I now use a mouse at work and trackball at home (strain different muscles). The clicking of the mouse bothered me for awhile, so for that I tried two mice. Right hand would control position and left hand would do the clicking. A foot pedal for the clicks would have been so much less awkward.