The current Mehomni, as were concepted, are supposed to represent the assault infantrymen used by Mithradates VI, from the material and area of Kuji. Essentially they are the warrior entourage of the skeptoukhoi/Eristavi of Egrisi, Argveti and Odzrkhe. They are Kartveli, but not from Kartli, though neither they are Margali...

About the horned helmets, the idea and concept was to represent more religious warriors, among the others. Keeping in mind for example how Xenophon talks about Pyrrhic/military dances, that were used also in Moesia and Mysia (ancient connection to Mushki?), but also among the Mossynoikoi/მოსინიკები, who practiced many public dances. There still are traditions today in the Caucasus, whereby men and women dance with weapons...
I've read also articles about the Kazbegi statuettes, interpreting them as such martial dances, a couple of figurines being described as two pugilists. That today this carnival-like Berikebi still exist might show how such traditions were powerful and even with Christianity weren't completely removed...

The Eshera shield model, I agreed also with Zarrr that will be removed, because from Abkhazia and outside of the influence of Kuji...

I hope you understand and see my interest in showing the Kartvelian culture in the mod, despite the limitations of the game and the number of available units...