After seeing ROTS again, I believe it can effectively be done....ending Anakin's onscreen presense with his metal hand reaching out and clawing at the rocks, then cutting to the shot of the shuttle passing over the rocks. That ends Mustafar. You can even leave the Vader scene in (if you removed all previous Vader references) by starting his scene with the mask coming down (not showing Anakin's face) and then change Palps and Vaders lines to
"My New Apprentice, Lord Vader can you hear me. "
"Yes, my master"
"Rise!"
"Where is Obi-Wan Kenobi?"
"It seems, you killed him"
"Good"

All using lines from the film and subsequent films. Scene ends with Vader facing Palps still strapped to the table and Palps cackle can be heard right before the cut.

Or something like that.