Here’s an attempt I made some years back. It’s a 1 pass clean with avisynth but I think with some more time spent stabilizing and interpolating the remaining bad frames it would look alright.
PW: OT
That looks pretty good! I know it will be really hard/impossible to get it BluRay quality, but what you showed looks good already! I only really needed to get the dirt and stuff out of the way in the first place. If you don’t plan on doing it much farther, could you send the result to me?