Also, an OT forum member Puggo, has made various 16mm and 8mm preservations. His best work is the Puggo Grande, a film transfer of an old 16mm print of Star Wars. He also made a transfer of another 16mm print of Star Wars that had Swedish subtitles and a transfer of Star Wars and Empire Strikes Back 8mm abridged editions. These could prove to be of interest to you. I suppose any one of these could be manually cleaned if one were so inclined to take the time and effort to do so.

As far as an actual transfer of a 35mm or 70mm print, I don't think this has been done and I'm not sure if anyone has access to a print or the equipment to commit such an undertaking.