How about going the other way and fitting a bagster tank cover over it? Stick a matching tank bag on and your sorted.
Being a very tall and large chap I find resting my stomach on the bag takes some of the weight off the wrists
Another alternative might be to try the paint protective film. Whilst it's normally used for the front fairing, I'm sure with a deft touch you could have someone fashion you a set of thin protectors for the back and sides of the tank.
Finally, take the tank off an give it to a decent painter. Ask them to apply a decent and liberal 2K clear and resign yourself to buffing the marks out at regular intervals.