So unfortunately we are unable to remove the background noises of the lightsabers. And because of that those lines would have to be created by someone who can do a good Anakin impression. But as you said, you aren’t interested in disturbing Hayden’s performance. So our only option would be to find a better way to isolate his lines in those places.
However, as a proof of concept, here are his first two lines de-aged:
https://drive.google.com/file/d/1arnygZfBjcmIBnS9OKvi1Wm-ftnx-PWX/view?usp=sharing
This is impressive, however, I’m not sure that the benefits of it is worth the extra work of getting a clean audio track. I want to see what the reactions to it on the workprint are first.
Honestly, if I could find a way to remove the saber glow from on their bodies, it would work infinitely better. But I haven’t figured out a good way to do that yet.