This is a mod I made for my own use, but I am posting it here in case anyone gets bored of the vanilla troop trees. It adds 6 new troop trees and bandit units, and renames and recolors the factions, giving them new leaders too.
Minor patch, just drag the two files into the foreign kingdoms module and replace them. It adds a new Swordsman troop tree, and it changes up bandits by adding remnants of the original 6 factions in.