The simplest way would be to have it "active" only for player, meaning that the AI factions would get +8 to loyalty or so from the script preventing them to have rebellions.
This also helps to prevent some related CTDs.

A friendly advice: do not get too excited about it as the feature is very unlikely to be implemented by the EB team and it's quite a challenge to get it properly balanced in a way that is not frustrating for the player.
My posts simply points that it's something techically doable although quite effort intensive given the possible results, I am in no way saying that the EB team will or should implement that*... Let's just say that the door would be open for extra modding...

*BTW, I am in no way affiliated to the EB team.