You could keep the whole “destroy the orbiting station by taking out the shield” from the movie, only replace the death star with some random imperial space station. This station could be a factory and/or have the Emperor onboard.
If you’re cutting too much maybe add scenes from Rogue One, such as clips of Saw’s rebels for the ending montage or Vader’s castle.
I don’t think that would be smart. To maintain technical quality, it’s probably best to keep the look of the entire film intact.