Suggestion - Offer the Flakpanzer 38(t) as a reward unit for the Panzer Elite's Armored Car. The Flakpanzer would provide better armor compared with the AC in exchange for speed and a rotating turret.
(http://www.militarymodelling.com/sites/1/images/member_albums/1461/FGVB23FEB08_001.jpg)
The Flakpanzer 38(t)
Why I Think This Is A Good Idea - I think the Flakpanzer is sufficiently different from the Armored Car for it to make a good reward unit. At the same time, without a rotating turret, I don't think the vehicle would be powerful enough to imbalance the game. Plus, the Panzer Elite already have several vehicles based off the Czech Panzer 38(t) chassis - the Hetzer and the Marder III - so the Flakpanzer 38(t) would fit in well with the faction. And hey - new vehicle!