Just to be clear, I'm planning to print these in the darkroom so I don't need the scans to look perfect. My goal with scanning is just to get something that will look like close to how an unadulterated first print will look. Hopefully that's what I saw. I guess I'll know when I make some prints how close I am to that goal.
I don't think the blue negative is correctable in the wet darkroom. If It was an unadulterated Ilfochrome it would be beyond help, but I realize RA-4 is a somewhat different animal. I'm just curious what caused it so I can avoid it happening again.