I only did the bleach, re-expose, and C-22 processing because I'd already processed the film as B&W, thinking I'd never find a C-22 kit. But I finally found one. The CD-3 in it (powder form) was fine, light tan powder, it was the bleach that had eaten through the foil bag.
I can understand your desire to do B&W processing first, to be sure that you get an image. If you process in C-22 with dead developer, once you bleach the film (which will succeed), there's no second chance. But developing as B&W first is really going to compromise the quality, and you have to use absolutely fresh bleach. It's a very nasty process, really hard to keep the film clean in re-exposure.
Instead of developing as B&W first, get some unexposed C-22 or E-4 film, expose it as a test roll, mix the kit, and see if it comes out with "reasonable" color. If it does, process the found film. If not, keep looking on eBay for another C-22 kit.