As I am now introduced to this thread, I must say there are a lot of interesting ideas. I hope you can accomplish what you are looking for.
I think I like the notion of Hux surviving and avoiding any betrayal. His betrayal and quick assassination went by so quickly and felt very cheap watching it. There is no perfect solution here for that, but the best of the bad solutions is to probably just show him with a few repurposed shots. Perhaps there is a possibility of AI added dialogue for him? I wonder if the actor has dialogue from another TV show or movie that can be repurposed for brief use?
The notion of Leia force healing Ben, which leads to her death, is the correct and logical choice. Another editor, Acbagel, has a work print of an edit to this movie. I liked what he did there. He had an illusion of Han Solo distract Kylo that led to him dropping the lightsaber. After that, Rey leaves without participating the healing process. Only Leia is involved. I think your added dialogue with that would be an excellent fit.
The Acbagel edit also uses an ending with Rey dying and Kylo on Tatooine burying the lightsabers. The material there could at least be partially useful for what you are trying to accomplish.
On another matter, there is another major edit to the sequels with information found here: https://www.reddit.com/r/fanedits/s/9JmdYVdwcE.
The planned release is for December. That edit plans to make Rey a lost twin of Ben Solo and has Snoke on Exegol (with an apparent Sith identity to be revealed). I have no idea how this will turn out, but the sample clips posted by the editor 21C Peasant on his YouTube channel look well done. There may not be anything relevant there for you, but this is one to keep your eye on just in case there is something you would like to incorporate if it turns out excellent.