Aerostich/Riderwearhouse has a little sheepskin cover thing that might work. And I don't think it would look Gold Wing-y...they also sell those buttpad biker shorts, and anti-monkey butt powder (a product I've never needed, but always wanted to buy just for the name).
Aerostich Comfort Stuff
Hey, speaking of Gold Wings, --how about Depend undergarments (ya know, the ones you can whiz in?). That would give you some bootay padding AND eliminate the need to make some stops. Now, if we can just get the in-ride refueling thing going...