I believe you should make it to where there are AOR limits, since it is exceedingly easy to make an army with no cost or AOR consideration, plus it is also not as fun as that army is impossible.
That's part of why I went with mine; the Seleucids can pull it off pretty easily. All they have to do is conquer Crete and build up the barracks in Babylon and they can get all three units.
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