I have no problem with removing the Ewoks since the Endor sequence is the weakest part of the film.
The extended bunker and Jerjerrod scenes would make up for it in depth.
Considering new material that needs to be created, realistically I think we can show:
- Luke going to Had Abaddon and surrender (Rogue, Ep II)
- Had Abaddon (Rogue, Ep II, TFA )
- Rebel base & holograms ( TFA )
A movie like this would be more “episodic”, with less exposition due to cut dialog.