Personally I’m in favor of keeping the Cloud City establishing shots to theatrical, just so it doesn’t look too slick or modern in contrast to the grindhouse flair.
Me too. I don’t think you should use not even a single shot from the Special Edition. Your project seems to me like an attempt to archieve a complete “workprint” of the movie before trims were made. If you add SE material, it will be another hybrid cut and I think it will lose a lot of its uniqueness. My opinion only, of course.