So, I spotted some things.
For the Bulgar tech tree:
Zera - indeed, Horse archers
Imnik - you could call them Chimnik also
Also, I'll give you some sneak info:
Khorasan Iranian Guard(I haven't seen them)
For the Abbasid Caliphate. Very powerful units, they were the "Varangian Guards" of the Caliphs.
We have them for the Khazars.
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