I bet if they had this tech during the development of TROS they would have used it. Ethically speaking, I’d say using this is justified if it helps a project achieve its artistic vision, particularly if it serves as a way to honor an actor that passed away.
I can’t remember: were you no longer interested in Leia saying “Come home!” to Ben when she reaches out? It would be a difficult line to sell but I still think it would be doable.
If you would like to workshop a line like that I’d be open to considering it, but it’d really depend on how it sounds and feels. Not a bad idea at all, and I don’t enjoy saying no when something you work on doesn’t quite seem to fit perfectly, to no fault of yours.
Also… do you think the Luke AI voice could be made to say to Rey, “Final lesson”? I think that would let us pay off the “three lessons” from TLJ without a clunky number that could feel jarring. And it means that from here on out it is Rey being sent off to fulfill her destiny with all that she needs.