Welcome Paul.
The seat and mirror issues I can relate to.
I've bought an AirHawk seat cusion for my ZRX, and have just ordered another for the 250R.
Worked well on the 750 km ride the wife and I took to Sudbury and back.
Now Lisa thinks she would like to try an AirHawk on the 250R.
Have also bought mirror extenders off ebay.
They will have to wait until maybe Winter, as I see now the fairing all have to come off to take the mirrors off!
Post up some pictures of your 250R.