Honestly, I don’t even know how, “No one’s ever really gone” would fit into the movie. Besides, I kinda think it would be gimmicky for Ben to say that to Rey after Luke says it to Leia in The Last Jedi. It worked with Leia saying “Never be afraid of who you are,” only for Rey’s Dark Side self to say that herself because the line was being repeated to the same character.

I think having Ben say things like, “Rey,” “I’m sorry,” “Please forgive me” under his breath when holding her could work.