Seeing as the Imperial Capital route is only a pipe-dream, I'd simply replace the Ewoks with Wookiees.
If a lot of new footage is going to be shot, I don't see why you wouldn't go the whole mile. They did, after all, plan a Wookiee ending before changing it to Ewoks.
It's easy to make the Endor environment a convincing Kashyyk and Wookiees make a more credible army.
We've known Chewbacca for the whole series, so it makes a more dynamic conclusion to finally see his race in action. We'd also get to see more clearly why "it's not wise to upset a Wookiee".