You can try Ebay for used wheels but there is not a lot about, I had to bite the bullet & order a new rear wheel from Yamaha after being rear ended recently. New rear wheel for 2008 £453.00.
I'd start with Oso's guide and see if it's listed there. Of course it's possible.... it's more a matter of how much work is involved. Is the axle hole the same size. Are the spacers and bearings the same size, do the front brake rotors align with the calipers on the fork? Etc., etc.
I'm guessing that's where the issue will be, due to the GSXR running inverted forks.