I would think that if you could scan the 35mm at a very high resolution, each frame could then be cleaned up with a scratch filter and the whole thing could be color corrected. This should turn out pretty good. I have scanned a ton of very old slides and they have scratches, etc. but my Epson scanner does an awesome job of automatically making them look like new old photos. I am a believer after seeing what that can do.

If I had access to a 35mm print, I would build a rig to run it through my scanner a few frames at a time, pausing for awhile so it could automatically scan the frames, then move forward and scan the next batch, etc. After it was all done, it would be a matter of carefully cutting and pasting each frame to get the borders right. It may be possible to automate this also if the film can be lined up exactly while it is scanning. Another way might be to use a tool that auto rotates it so the edges are perfectly horizontal and vertical, then look for the edges of the actual picture and auto crop it.

Anyway, it would be a fun project even if it took 3 years to complete for one film.

I am not sure how to post images, but I just did a quick touch up to a frame from the Puggo Grande to illustrate my point, and it came out pretty well.