Would you be interested in help with carefully performed content-aware photoshop fixing of nicks and scratches on each frame? I would be happy to help with this. I did this with my trailer project I was working on and the end result was beautiful. If we all helped, we could get through all the frames and have a near-blemish free final product. People would need to be careful not to fix things that are in multiple frames because they are supposed to be there but look like a blemish.
I love the idea of everyone helping to manually clean. I would certainly give some time to a certain number of frames.