Tell me about your map and i might help you with other triggering/ideas or just create an ai.
Creating AI for Dota maps by yourself is really simple. Add an event every 1-2 seconds of the game. Then as a action pick every player then check if that player is controlled by a computer, is not an creep player and its hero is allive. If the all the conditions are met, it should check if the ai is low on life if they are, they should run to their fountain. If not, they should check for enemy heroes. IF non are nearby the should find the nearest creep and follow them. OR you could just ask me to make some ai, but i would like to see your map or just hear more information about it