How about just new campaigns instead of new civs?

I know this is not the best answer but you could check out the Persian Apranik campaign by Hainaut183 and scenarios by Filthydelphia
I mention them specifically because Filthydelphia used to develop official campaigns and Hainaut183 is now part of the official team so, those campaigns and scenarios are as official as a non-official campaign or scenario can be

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