Call fast, tell them you need a bottom end rebuild kit with a modded shift shaft. That'll have all wear items replaced.
Send out your trans to be modded, get new billet basket with clutch, and pancake bearing.
You will swear you have a totally new bike. Any bike I ever do will get a modded trans. No questions asked.
Yeah it'll be a few bucks up front, but it'll save you money, time, and headache in the long run.