>>2169647
I'm using the mod Custom Series to plan the Troop Trees in-game.
The game handles three 'Occupation' of troops: Soldier, Mercenary, and Bandit. I don't know if there's any difference between Mercenary and Soldier troops other than Mercenary troops being more expensive to maintain, but with the mod it's perfecty possible to make one Soldier troop troop upgrade to a Mercenary type troop and viceverse because Occupation is tied to the troop, not to the troop tree.

I was planning on also expanding on the Mercenary troop trees. With Feudal Warfare the player is mostly forced to rely on recruiting Mercenary troops from Taverns if they want to get troops for their army.
What I could do is expand the Mercenary Troop Trees from T0 all the way to T5 or T6 and make them more varied so that they're the troops the player will find easy to recruit early game but can turn into excellent troops, at the drawback of being very expensive later on.

Meanwhile, the levies lords can recruit from Notables would have a more strict upgrade pathing, but be cheaper and of course much easier to recruit for the actual Lords of the fiefs.