I've checked recently some sealed R-3 paper from ebay (exp. about 1997-2005) - unfortunately, It's all dead. It has heavy pink fog and one box - a lot of fungus. Angifog agents do not help. Perhaps, if you will find deeply frozen paper, then you will get a chance, but I think it will be unlikely.
R-3 recipe can be prepared by msds, it doesn't matter that you cannot exactly know the proportions - it can be fixed by filtering.
http://hazard.com/msds/gn.cgi?query=R-3+DEVELOPER&whole=partial&start=0
For experiments you can start with RA-4 process and negatives.
I think, you will get more significantly more chances with old Ilfochrome - it will be disbalanced, but there will be no color fog at all.