You don't want the base stain anyway. Overall stain just reduces contrast in the shadows. Proportional staining is best. So compare the highlights on the negatives from different fixers. The one with the least base stain but adequate image stain is the one you want.
FWIW, I've been using Ilford Hypam and Rapid Fixer with my PMK negs for years and years. The stain is just fine.
Best,
Doremus
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