Its actually not that complicated. Just deciding which core regions qualify and which factions should be re-emergent. With MTW2 might even be able to add a counter so if a region hasn't changed hands in 100 turns its now effectively assimilated and there is nothing to inspire a revolt.
Seems better than larger empires losing a couple provinces here or there and always quickly recapturing them. At least some spawned larger stacks and renewed faction would be much more interesting and in more cases than not seems plausible for the span of EB2.
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