I read somewhere you can process the film as a black and white but don't run it through the fix. Mix the bleach and fix up for the C-22 process and finish processing the film that way. The website that had this tip on it has gone away and I haven't tried it myself but it might be better than mixing solutions that will just sit and go bad. Or you can process it as a B&W neg and scan and remove the orange mask digitally.