I've thought about buying a cheap 2nd hand rider seat off eBay for my Curvy and doing what you say.Even my Curvy's seat can cause a bit of Numb Bum after I've been out all day say after 150+ miles.As I'm a tightwad I keep a small oblong of 3" deep foam rubber rolled up in my packpack and stick under my A*se if it starts going dead