What about doing exactly the same thing, but only with the death star now circling around Coruscant?
In A NEW HOPE REVISITED, the Death Star was circling another (anonymous?) planet when it wasn't yet operational. The concept of the DS circling a planet could thus sell the idea of it not being operational yet to the Rebels.
The moon of Endor could become the moon of Coruscant. But with Endor being the name of the moon instead of being the naam of the planet to which the moon allegedly belongs.
The Emperor's master plan could then remain the same and in the end shots could be inserted indicating that the Emperor's palace is being destroyed by the wreckage of the Death Star, explaining why Luke and Vader try to get out of it as soon as possible.
But this would mean an awful lot of re-editing and the creation of new shots, which begs the question: will making these rather aesthetic than story-based changes actually contribute positively to the movie? Since this would include numerous changes to dialogue in order to make this relocation of the events happening fit in, one could ask the question: how much can actually be improved upon this movie storywise since story is usually conveyed within dialogue rather than special effects as hopefully everone here agrees.
I'm not saying effects and locations and such cannot contribute to the story, I just don't think they can contribute in the sense that they can carry the movie, especially not the way dialogue and plot does. Which is quite obvious, isn't it?