I can think of a solution, but it would take someone providing VFX work again, and some good old fashioned “something out of nothing” editing work in keeping with Star Wars history.
“I am all the sith.”
“And I…”
(helicopter noises, music rising)
Rey’s hand, waiting for the lightsaber, catches it.
At this point, I’m suggesting either looping forward/reverse that shot of her holding the saber JUST long enough to give a tiny beat before you layer in “I’m Nobody” or “I’m no one” OVER the shot of the saber in the hand. To punctuate it, she ignites the saber BACK THERE, and then IMMEDIATELY swings the saber up out of frame from that shot rapidly, and you cut just as rapidly to the camera pulling back as the saber comes up into frame.
But you’d need to
- extend her holding it just a tad through tricky
- animate a saber igniting
- animate the saber coming up and out of frame (or at least starting to move in that direction)
In order to create enough continuity to cut straight from the saber moving up and to the left to match with the reverse shot as the saber is coming up and from the right while the camera pulls back.
I guess the only other way to get it to work exactly the way you want is to establish at some point earlier that these two can and will communicate telepathically in their final duel (add reverb and weird effects not unlike the Force Skyping) and then you have to creatively edit so that their dialog is playing over scenes where their mouths are decidedly not moving - and then you can basically rearrange their words wherever you want, cut to close-ups of their eyes or hands whenever you need it, etc…