Installed 1-2 shift collar BACKWARDS. Alternate removal options?

I'm kicking myself in the head so hard right now. I'm working on rebuilding my A833OD, and was in the final assembly process until I realized that I had installed the 1st-2nd shift collar on backwards. Words cannot explain my frustration. I'm only upset because it means that I have to take the shaft BACK to the tranny shop to have them pull the mainshaft bearing and then press it back on once I have flipped the shift collar. And it's the weekend.

Is there a way I can just rent a bearing puller and then do it myself?I f it would risk damaging the transmission then I'll do it the right way, but I really don't want to have to mess around with going back and forth to the tranny shop again. Can I just rent a puller, and then heat the bearing to slide it back on? Or is that a horrible idea?