A satrapal army might be interesting, maybe a few gathered together as a sort of rebel state. You’d have all the usual Achaemenid floribunda without the showboat regiments like the huvaka.
It sounds like an army centered around the ‘Revolt of the Satraps’ from the 370’s – 350’s B.C. would be right up your street, then.
"Ventosa viri restabit." ~ Harry Field