So your mod will override or conflict with other mods that alter realm divide? That's not good and is something that doesn't need to be messed with in an AI mod.
TROM3's realm divide:
"Changes to Diplomacy
- Realm divide event changed significantly: Instead of a low initial diplomacy hit which adds up every turn by -5 points until you get a -200 penalty, you get a moderate initial hit (around -55 on normal difficulty) which gets reduced every turn by 4 points. That way allies and factions you have good relations with may stay on your side and diplomacy doesn't become impossible after the realm divide event."