The main interest in this film is that it is a window in time. If it's on film, and it doesn't have ANH in the crawl, then it is pre lots of other tinkering too. We would know it contains nothing that was added or changed for the saga, or "improved" for the laserdisc. THAT is what is interesting about it... not that it's going to generate a better quality image.

As far as fixing things up in post, by far the biggest factor in getting a good transfer is the film capture itself. There's only so much you can do, even if you're a wiz in avisynth, if you start with a ho-hum scan. I regularly use a half-dozen avisynth filters on my film and video restorations (including deshaker), and they all can really only be used very conservatively before they start producing artifacts of their own.