Hindsight is always 20/20. So I would go back to the original script meetings and steer the conversation into a new direction. For example, they were discussing Had Abbadon for the setting of Jedi. The theme of the movie was to be a more primitive people overthrowing a technological regime, and Endor was a moon over Had Abbadon. I would have consolidated the final battle to simply be a group of enslaved aliens on Had Abbadon being feed by the Rebels, including Luke, Han, and Leia, and using their knowledge of the imperial complex to infiltrate it and take out the Emperor. Meanwhile, the Imperial fleet would engage the Rebel fleet over the planet. Luke and Vader would have a final confrontation in the presence of the Emperor, while the complex slowly destroyed itself from within. The outcome is largely the same, as in the completed movie, and there could even be a few Ewoks in the mix of freed alien slaves.