I think a music change would definitely be in order (sorry, John Williams) to something less "cute", and integrate something more mysterious and/or threatening from one of the other films. I think you could acheive a lot with the Ewoks' scenes using just this and a few well-placed cuts and subtitles.

i.e. - cutting out all the slapstick bits, including the stupid "3PO Storytime" scene, with female Ewoks clutching cuddly little babies and so forth. That scene always makes me feel like I'm in Kindergarten again, (which, of course, I was in 1983).

But, not in a good way.