I have some expired color paper Fuji Crystal Archive Super Type C. I just wonder what it looks if I print BW film on it. I can still process with RA-4. I can use with either color head or the VCCE head. I only want B/W prints.
It's going to be tricky to get the color balance neutral, but you could try. I'd give it a shot with a sheet/strip of developed but unexposed c41 film as a filter below the lens to get in the ballpark and the take it from there.
It'll work best with low contrast b&w negatives as ra4 paper is inherently quite contrasty. Try a negative that prints well on grade 4 or 5 b&w paper.
It would probably be easier to aim for a particular tint than to try for neutral grey.
A warm tone similar to sepia is what I aim for when I have a lab print from a digital black and white file - if the colour is slightly off, it still works.