A fully realized AU always means considering all the things that got changed, and you seem to have done that. I've had to consider, in another venue, what Starfleet's fortunes would have been like if Archer's era had included Kirk-like tech, and then Kirk's Picard-era tech. That you are doing this sort of thing means we are in for a good story.
I forgot to say above : with no regular influx of younglings, the Order would have to find ways to keep older warriors around, since accomplished Jedi are often known to become hermit-like even without downfall or disgrace. The debate about married priests in the RC Church comes to mind.