Hi Nat,
The Austrians can field a brigade with one regiment. However, doing that does not really save anything as 2 regiments still need 2 command rolls whether they are in the same or different brigades. You also have the probem that any artillery battery will need a sperate command roll to move.
I have played around with small cavalry abteilungs, but they are a bit fragile having only 2 stamina.
