You know, here's a conceivable way how to do it.
Just keep the current series of events. When you get the seize power trait for one of your guys to become the Augustian, you get two choices:
Make him heir and trigger the civil way script where you're seizing power. Depending on his traits, we can have a few turns where people throw in their lot. So basically generals and FMs of the empire slowly go rebel within about 5 turns at which point the going rebel stops.
To do this, you should give everyone a hidden trait on whether or not they will side to maintain the Republic based on various traits(loyalty, ambitiousness) and genetics(it would be nice to have fathers have the support of most of their sons when they do this).
Now... if you don't make him the heir within a few turns, he'll go rebel along with a few generals and kids that support him and you can probably figure out a way to script him to beeline suicidally for Rome.
Obviously, this gives the player the ability to either play out a harder campaign to reconquer the empire and get some neat units to finish out the campaign or an easier campaign but no new units. Its an interesting dilemma and it could happen a few times. It also would occur some time after the Marian reforms.
You could use this sort of thing for all the factions really.
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