Reegar said:

This reframes ROTJ in a sinister light across the board. The Emperor here would put Dumbledore or Jigsaw to shame. Some of the details of his master plan may be difficult to convey without exposition dumps in the story, but that might be compensated by the fact it's so fascinating.

Much of what you have here seems to be in hindsight, though. It's revelations of past events. How will Luke, if he's the one to do it, arrange another assault on the Empire in the future? The Rebellion here sounds all but destroyed. We end up in much the same place as in the beginning of ANH, but with a cast of different faces perhaps, and the potential for another Force-sensitive.

I hope you can get around to writing this, even in prose. That'd be a huge task. I can understand if not. But it'd be nice to see you at least continue to develop the plot.

I've kind of taken a hiatus from Star Wars writing, but I may flesh out this idea in the future. So far this idea is my favorite for a post-ROTJ world, as it "fixes" ROTJ to be much darker as you said.

The opening crawl of Episode VII would be the most difficult aspect to get right, as it's basically a revelation on the magnitude of "I am your father". I'm thinking that it may have to be a bit longer than normal, and the music should change. Still brassy and bombastic, but with a heavy undercurrent of choir for the Emperor's triumphant theme. Here's a variation of the above crawl:

It is a time of galactic tyranny. The evil EMPEROR OF THE GALAXY, using a twisted clone decoy, lured a fledgling rebellion into attacking and destroying an Imperial superweapon at the moon of Endor.

This rebel victory was short lived, however, as Imperial forces regrouped, and the moon of Endor was soon pulverized under the firepower of the entire Imperial starfleet.

The rebel heroes Luke and Leia Skywalker, narrowly escaping the devastation, evaded the Imperial starfleet and escaped into exile, gathering new strength in the fight for justice and freedom among the darkening stars....