Rewatching the duel from ROTS I’ve got an idea of how I would have it play out. Keep in mind I suck at editing, so this is only an idea.

-Duel is much shorter and dialogue is at an absolute minimum
-Anakin has a red saber
-Anakin hardly has any lines, it works better if he says less. He’s got an expressive enough face.
-Music would be replaced…hang me. I love the music from the duel, but I’d like to see the duel with less fanfare. Perhaps even no music. Could be similar to the Empire duel, in that there would be certain cues scattered throughout the sounds of droning machines and wind.
-Obi Wan cuts Anakin legs off, he falls out of frame into the pit scene above.
-Obi Wan says his “You were my brother, I loved you” line and leaves defeated
-We don’t see Anakin after he falls. As far as we are concerned Anakin is dead.
-No Palpatine retrieval scene. No Vader suit scene. No Death Star reveal.
-No Padme death scene. I’d even leave the fate of Luke and Leia ambiguous. We’ll find out their fates in the good films.
-Perhaps end with the birth. Play a music cue (Princess Leia Theme from Star Wars, Brother and Sister from ROTJ" from the OT to end on a positive note. Cut Yoda going to Dagobah. Cut Obi Wan delivering Luke. Less seen, less ruined.
-That way Leia can still kind of remember her mother.

I might come up with other ideas if I watch it again. I just got a quick refresher on Youtube.