Well, the Kura runs through areas that, 6000 years ago at least, were Indo-European and Kartvelian (or proto-Kartvelian). So possibly you could end up with a hybrid civilization with both.
Indo-European languages with significant Kartvelian influence.
Why do you think the PODs required to make a proto-Karvelian civilization on the Kura would be messy? Or more messy than an Indo-European civilization in the same place?
fasquardon
I'm just not familiar with the proto-Kartvelians. My assumption was that if you go far back enough it might butterfly them away entirely. I wasn't aware of whether or not they were contemporary with the PIE folk or not.