It's kind of hard to make a faction with distinct troops the way Native has its troops equipped. You'd have to rebalance them, too, I'd think. Just imagine taking out all shields, two-handed weapons, and good one-handed weapons from archers - as well as metal armors. If that is a starting point, then you could work from there. Also, remove bows from Khergits who aren't Horse Archer types. Also, assume better armor and shields for Rhodok Sergeants. Using these assumptions then ...
How about a mixed-unit faction? One with a little bit of everything in terms of troop types, but no real specialty. For example, top tier units could be:
* Skirmisher: (not a Veagir Skirmisher) Short Bow, decent 2-handed weapon, high Athletics, non-metallic armor. Better hand-to hand skills than current ranged units.
* Heavy Horseman: rides Hunters, maybe spears, high Riding skill, armored lighter than Vaegir or Swadian Knights, good two-handed weapons.
* Light Horseman: rides Coursers, no spears, sword & shield, high Riding skill, armored similar to Nord Veterans (Byrne or something).
* Solider: Armored lighter than Rhodok Sergeants, but slightly better Athletics. Mix of good two-handed or one-handed weapons. No polearms.
* Pikeman: The standard long polearm type.