Is there any way to force a civil war?

Got a high flying general, just became my faction leader, had his triumph around 5 turns ago. Think he's around 43 at present (I'm using a multi turns per year mod, so they're actually worth building up). I think it would be pretty cool for him to become the first Emperor.

Not a huge fan of the civil war as is, hope someone can mod it eventually, but got to work with what you have for now.