You raise an interesting point: using panchromatic paper. The easiest way out here would be to print the negatives on color paper.
But regarding my original suggestion: I believe that when you use multicontrast b&w filters, yes, orange may be low contrast, but magenta is higher contrast. I think a typical dichroic head could almost certainly provide the filtration to bring the contrast up. I would use a color analyser, get a reading of say a grade three filtration with a true b&w neg, then put the c-41 b&w neg in and adjust the filtration for the same reading. Probably a dichroic head would have enough filtration.