I think much of the color bleeding is due to the colors being shot at different times. Prokudin-Gorskii images have color bleeding and most of the subjects photographed are static and still. Motion interpolation and color enhancement is a bit different than merging the RGB channels from different moments in time back together. It's similar to deinterlacing fields of video together to make a progressive frame. Results can vary and artifacts will probably still exist when there is a lot of motion.

I guess one could attempt to get a luma(greyscale) version of the film together using the different channels and then attempt to fill in color using approximations. Sounds like a lot of work.