Sounds like an interesting idea. Certainly bold, if you ever plan to go through with it. If that is the case, I would suggest to show bits, like the Kenobi brothers adventures and the Jedi Civil War, in flashbacks. That way it would cut down at least a little bit of the workload by combining certain story elements. Another way I think could help (and this is only if you really want to differ in style from the actual movies) is to have Lara and intertwine her story with Luke’s, e.g. you could have your OT be about the twins on parallel journeys that eventually lead up to the two meeting or you could have Lara start out as a minor character in the beginning before she joins the main cast. Of course, that could get rid of the the whole time-dilation planet.
For the prequels, it might be alright as is. It is like we talked about in another of your threads, where Obi-Wan is frozen and released by Anakin. Very interested to see how that would go, but I personally am not sure about Obi-Wan being directly involved in overthrowing the Republic to establish a Jedi theocracy (that’s more based on my presumption that Obi-Wan would have a different mentality he had from the High Republic than the “current” ideology of his fellow Jedi). You could still go for it, but maybe Obi-Wan’s reluctantly going along with it and/or he wishes to join to sway the other Jedi’s minds (or some other hullabaloo).
For the OT, Lara’s the only major change I recommended. Other than that, I can’t think of anything else. If you want to, maybe hint at the emperor surviving in spirit form or something akin to it.
For the epilogue stories, what you plan feels like a HUGE stretch, but it might work with the right tweaks and revisions. If you want to keep Lara there, maybe you can keep the time dilation planet or use carbonite instead. Luke’s ghost could guide Lara into rescuing the few who survived and taking them to Earth, which could be more hinted at than directly shown (so to keep the mystery).
That’s all I have. I dunno if it’s any good, but I hope it helps. Take care.