Okay, we have a faction already thanks to Kingdoms. We have functionality for emergent factions carried over from BI (I think). We also have the ability to switch factions via script (similar to scripts to auto run and jump into the seat of Mongols or Romano-British). Would it be a stretch to slot the KoJ faction into the Grand Campaign (retrofit of course) as an emergent faction that is created when a Catholic faction takes the city? And with a script gives the player the choice to play as them or not.

Thoughts?