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

I tried 250 degrees, in a smoking hot oil bath. I think 500 is too much, but that's an opinion. 250 didn't work. I tried 400 in the oven, but every time I tried that I killed a good pair of oven mitts. And by the time I got the set-up, set up, it was too late, the bearing went part way on,got stuck, and there I was, fuming, cuz now I had to get the stoopid thing off there again, and dang, everything was hot!
So good luck with that. Not being an azz, good luck.