Would a recumbent exercise bike work? Most of that pressure is on the sitting bones and pelvis. I used to bike 140-160 mi/week, and padded bike shorts only do so much on standard bikes. Probably 8 years ago Lance Armstrong joined some of the Ride the Rockies segments and he gave a talk about his testicular cancer and Live Strong. Now he does mountain bike riding and racing. Interesting fellow, an odd mix of generosity with Live Strong. and being a jerk.