I think you should pursue this idea.
Acbagel did something similar with his edits, though I think where he ends up is different from your ideas. Though I don’t think either interpretation is any less valid.
Going into the sequel trilogy, I also felt like the flaws with the old Jedi doctrine were going to be addressed in some way. Addressing this doesn’t mean the answer is a ‘gray Jedi’, but I think a future Jedi order would have to learn from the mistakes of the old one, which ties into TLJ’s message of failure. I mean TFA makes us ask the question, “What went wrong with Luke’s Jedi order? Why did things fall apart again?” TLJ does end with Luke reaffirming the Jedi, but I still thought we would go into TROS with ghost Luke passing on some wisdom about how the Jedi need to grow, but the film never really gets into that.
The prequels paint this picture of the Jedi’s views on emotion and attachment being a double-edge sword. On one hand, it takes away temptations from the dark side, but the Jedi don’t seem to teach their students how to deal with their emotions. They just tell them to let them go, or bury their feelings. And this bottling of emotions tends to make some people erupt, which is what happened to Anakin.
Again, at the same time I also think you could see the films as saying that evil will always rise, and so it is worth fighting even knowing evil will rise again in the future. But I think there is merit in wanting to end on a different note. That the next generation will try to learn and grow from the past, rather than just do the same thing over again. And TROS doesn’t really continue that idea explicitly beyond Rey having a new lightsaber color (which isn’t really new outside of the movies). So to me, the idea of making Skywalker a title is like a rebranding of the Jedi, or simply a new denomination of Jedi.
With the Be With Me/Jedi voices scene, I’ve had two different ideas for it. On one hand, you could change the Jedi voices to give her advice that shows that they’ve learned their mistakes from the netherworld of the Force, and are ready to pass on that wisdom to Rey. Stuff about how her fear or anger do not define her. Not sure if you would try to rework lines from those characters throughout the movies, and maybe throw in some new original voices of unknown Jedi to get specific lines to hammer your idea home.
Another idea could be that when she says “be with me”, instead of hearing the Jedi, she could hear/see glimpses of her found family (Finn, Poe, etc.), and this motivates her to stand up and face Palpatine. It would be more implicit, but the idea would be that her attachments gave her strength, rather than making her weak.
Anyway, just some ideas but I get what you’re going for.