I was thinking of using Rodinal 1:3 for maybe 2 minutes, then put it into a bath of Rodinal at 1:100 for say 30 min's. These are just some numbers I spit balled but will be the starting place.
Should be interesting to compare results. The film I will be using is APX 100 in 4x5. I'll probably cut the sheets into thirds and tray develop. This way I can try different times with the same subject matter and not waste, hopefully, to much film.
If anyone has done this before please let me know what you came up with.