I think AI could be used to create a single, three-in-one version of the Sequel Trilogy with a coherent and linear story from beginning to end. If I were to make something like this, these are the changes I’d personally make to the narrative:

I’d remove Snoke completely and establish Palpatine as the main villain from the very beginning. I’d explain that Palpatine had created several clones of himself before the events of Return of the Jedi. When Anakin threw him down the reactor shaft of the second Death Star, Palpatine transferred his Force essence into one of those clones, allowing him to survive. He would then spend years gathering the remaining Imperial forces to build a new empire, which could be called the Dark Empire or the New Sith Empire. He would already be leading this new empire when the story begins, and he’d also be the one who manipulated and corrupted Ben Solo
Han and Leia could still have separated because of Ben’s fall, but I wouldn’t have Han completely return to his old life as a smuggler. I’d have him remain involved with the New Republic in some capacity. He could perhaps work as a military commander, an advisor or some other figure involved in the Republic’s efforts to deal with the remaining Imperial forces. However, I’d still keep Ben as the one who kills him.
I’d completely remove the revelation that Rey is Palpatine’s granddaughter. Rey would simply be Rey, with no secret family connection to Palpatine or any other major character.
Rather than having Luke go into exile out of guilt for Ben’s fall, I’d have him withdraw to meditate and ponder his mistakes. After Ben falls to the Dark Side and destroys the Jedi Temple, Luke and Ben would have a confrontation where Luke tries to turn Ben back to the light, just as he did with Anakin, but fails. Following the destruction of his New Jedi Order, Luke would go into exile on Ahch-To to reconnect with the Force, meditate and search for answers. When Rey arrives on Ahch-To, Luke would realize that she’s the answer he’s been looking for. He would decide to train her, recognizing that she might be capable of defeating Palpatine.
I’d keep Luke’s final confrontation with Ben on Crait and his eventual death largely as they are. His death as depicted in The Last Jedi works very well within this version of the story.
I’d make Ben’s internal conflict more visible throughout the entire story. He wants to return to the light. He knows he has done terrible things and that returning to the light is the right path, but he doubts whether he has the strength to do it. Naturally, Palpatine would try to convince Ben that he has gone too far to ever come back.
I’d change the final confrontation on Exegol so that Rey and Ben face Palpatine together. Palpatine would ultimately defeat them both, leaving them unable to keep fighting. At that point, the Force ghosts of Anakin, Luke, Obi-Wan, Yoda and Qui-Gon would appear to confront Palpatine and assist Rey and Ben, with Anakin ultimately being the one who defeats Palpatine once and for all.
I’d use Anakin’s defeat of Palpatine to reinforce the idea that Anakin really was the Chosen One. He defeated Palpatine in Return of the Jedi, and now, even after his death, he would be the one who finally prevents Palpatine from returning again. That would give Anakin’s story a much stronger conclusion and make his role as the Chosen One meaningful all the way to the end of the saga.
After his redemption, I’d have Ben leave and go into exile. He would need time to rediscover himself and figure out who he is after everything he experienced as Kylo Ren. I’d treat this as the beginning of a personal journey for Ben, giving him time to come to terms with his past and eventually find a new purpose.
I’d have Rey stay behind to begin rebuilding the Jedi Order. She would follow Luke’s example, while also learning from his mistakes. This would give Rey a clear purpose after Palpatine’s defeat and allow Luke’s legacy to continue through her.

Obviously, if something like this were ever made, the vast majority of the footage should still come from the original movies. AI should only be used selectively to generate new shots, a few short scenes and some new dialogue where necessary to fill in the narrative gaps and make this rewritten story possible.