Yeah, it’s hard to find the balance between detail and complexity.
Just tossing this one out there:
Spend 5 IPC to target one enemy or neutral territory adacent to a territory you or an ally controls. The territory must not have a victory city.
Roll one die. Add 1 for every enemy or neutral unit in the territory. Subtract 1 for every territory you or one of your allies controls adjacent to the targeted territory.
If roll is 1 or less, you succeed.
1. If territory was enemy when you succeeded, the enemy may move all units from that territory 1 space to a territory friendly to him or her.
2. If units cannot move, they are destroyed.
3.The territory becomes a neutral power aligned with your side.
4. Place neutral infantry on the territory equal to its IPC value.
If the territory you targeted was neutral, remove all infantry on the territory and execute steps 3 and 4.
(Thus, if you attempt a coup in a territory that was already friendly to you, you will likely lose military support, which makes sense to me)
That’s the dirty version, my dog wants to go for a walk.