Just go ahead and process the film with all the correct times and temps and steps, and remove the rem-jet coating after processing. It's quite easy to do, using a bowl or large photo print tray, with a water bath the same temp as processing having added Borax to help remove the rem-jet backing. At least 2 tablespoons per Liter of Water as a minimum, if stubborn, double the amount. Run the film a foot or two through a soft photo grade sponge soaked with the solution, rinse often in clean water and keep repeating. A 100ft(30.5m) spool of film will take you about 10-15 minutes on average. Once washed again for just a couple minutes, use a Final Rinse solution for good film. For such old film just for experimenting, a Film Wetting/Drying agent such as Kodak's Photo Flo is fine to allow even drying. Afterwards when you have time, Filter your chemistry thru some cheesecloth to get any traces of the rem-jet out of the solution. You could use some finer filtration if available, but some types will filter very slowly. I filter clean each solution just to make sure there isn't any carryover into them all. Have done this for several decades and works fine, doesn't harm the chemistry. Good luck!