Why not experiment including some Mercenary camps? They work as well in DE. Not as I requested in my design( need lot coding) but is the foundation of the concept.
As of Alpha 17, the game has a mod selection screen, which can be accessed through the main menu: Tools & Options > Mod Selection
https://trac.wildfiregames.com/attachment/wiki/Modding_Guide/mod-selection-a17.jpg
You need activate in main menu