You could try copying the saves onto a thumb drive or memory card and move them back on when you get the new master account set up. Once you do that you could then delete the old user off the PS3- it'll still be in Sony's database but that isn't a biggie. Any purchases from the PlayStation Store would be lost too, btw, and you would have to redownload any demos and/ or movies you had. You may be better off putting up with the name.