I have an idea for a new unit.
How about a generic unit type to represent a region of Westeros. Generic units types such as archers, cavalry, criminals, crusaders, engineers, garrison, guerillas, infantry, mercanaries, peasant levies, personal guards, raiders, sailors, and scouts. However instead of one unit card in each box there would be multiple unit cards. Each card representing a different minor house from that region. Thus changing the abilities slightly.
Example: Northern Infantry
Units Cards: Cassel, Cerwyn, Dustin, Flint, Glover, Hornwood, Ironsmith, Karstark, Manderly, Moss, Slate, Tallhart
Unit must be allied with Stark faction or even Night's Watch depending on the minor house the unit card is representing.
If you take a moment to look at the scope of Westeros. There are a lot of unit possibilities with the dozens of minor houses in each region