Vanch can be almost any mix of units derived from Orlanthi, DH, Lunar-influence, Praxian-influence sans beasts, etc. The original Zarkosite slingers were from this area too (hence Anatolian slingers fit well).
Imther's had Orlanthi refugees over the centuries (e.g. those escaping the EWF, the Dragonkill, the horse nomads, etc.) plus has their own ancient Sun Dome to bring in varied spearmen. Given the mountains, slings, javelins, spears, etc. all work well and axes based on the hilly woodlands. I always thought the roughness of Anatolia translated well.