I don't think it'll work in the duel because we don't have the souce material for lines like "No longer exists..."
BUT, in ROTJ Vader's line could be changed to "Padme once thought as you do." Using the "Padme" from ROTS. She was the one who felt there was still good in him. She was the one who confronted him and told him he could come back with her. Ideally, he'd say "Your Mother", but since Vader never said that, I think Padme would work just as well.