That’s an interesting thought experiment. I actually have an idea for something like that, and I’ve been thinking about it for a while. It would be a completely redone version of the trilogy, with almost everything changed. The plot would have some significant differences, character appearances, backstories and motivations would be redone, and the science would be much harder. Think of it as more of a re-imagining than a remake.
I’ll post more details in a new thread soon.