I can probably wip somthing up this weekend or next week, just so people can get an idea of how they work, their implemented right now but very half hazardly in a way thats not very user friendly, for example they dont project the players territory yet and so can be reclaimed by gia after a while unless you build a town centre next to them, another issue is their units taking up player pop, these are simple fixes that can be implemented when i have time
Here's the current messy basic version with a bunch of bugs in if you want to try, they might not spawn every game, so reveal the map when playing if you want to test them, they currently dont create an attacking army but the rest is there.
Give vassals a second to spawn in after the game starts.
vassal_settlements.7z