I feel like he wouldn’t comment on it until he actually saw it, like when they first clash sabers in his chambers. Unless he is just gonna talk about the physical modifications she made to it. I think Kylo actually says something in that moment while they’re holding their sabers against each other, so it could be a good spot.

Since the voice AI tool is allowing us to not having to trim as much and make the edit more seamless, I think the voice AI stuff would have a significant benefit during the chamber duel in regards to a Rey Nobody edit. You could keep the entire scene, just replace Kylo talking about her parents to Kylo talking about the fate of her friends, and you could replace the “flashbacks” with “flashforwards” of the battle.