This could be material for one of their campaigns imo. From your post, I understand wari 1B to 2B is almost 200 years of war. Or am I wrong?
Moche could be represented by Chimu, in case they are added. The campaign could start portraying the wari moving northwest and conquering nazcas and wankas (hehe) in a pit map surrounded by mountains, like arena or fortress. In the second part, it becomes a battle royale challenge against the moche. The last part could be a tower defense mini-game, like green td from wc3, against the moche to represent those decades of attrition.
Edit: The migration part after their collapse could be represented in escape style mini-games, like those escape maps or uther party from wc3. Something like the waris have to go back to ayacucho to become the chankas as the goal.
Idk I can see the potential in that event but I am not sure how to implement it. Something fun with mini-games would be cool. Like PhillySouljah’s campaigns.
Filthydelphia’s Campaign Collection - Age of Empires II: DE / II - Modding - Age of Empires Forum
His campaigns are pretty cool and fun.