Darkroom print from color negative processed as B&W

It's a long story, but I have a few 120 rolls of Ektar that were processed as black and white in HC-110. The scans look surprisingly good, but my intention is to print them in the darkroom. If I try to print on Ilford Multigrade, will the mask totally mess up the contrast? The color of the mask looks suspiciously like the color of a safelight, making me wonder if I'll get anything at all. Ideas? Suggestions? Thanks!

Exposures will be long due to the mask, but it'll print OK. You may have to bump up the contrast quite a bit because C41 film doesn't have all that much silver in it.