I normally run the money script to keep all units around 300,000 mnai, once I want to rp an extended peace between Rome and say the Aedui, I just cut the Aedui money down so that they only stay around 10,000. Without money they don't attack and when another war is ready to start up I bump them back up to 300,000 and the fight is on. Just an alternative to the method you proposed which sounds pretty effective itself.
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