I think the hardest part of this would be making it look convincing enough that it would appear to belong right after the original trilogy in the 80s.
Too cheap looking and it’ll look like a bad fan project.
Though in saying that, you can’t get too much of a step down from those horrendous green screens in ROTJ, right?

I’m decent at adding artifacts and grain so I’d offer what help I can, though if you’re making major edits like above I’d be worried if you couldn’t do that yourself.
Good luck, I’m actually quite interested to see how this turns out.