Thinking more about it... I might make two versions of it.
One verison would be the one I talked about, and one which is just the three factions as a PA-IR playable only version, where I leave out the better aspects like defecting heroes and such, only with the friend mechanic being there, so it really is just a simple 2v1, BUT it would be a co-op version for multiplayer.
Yes, I know it is problematic that you can't fight against the AI on the field, and that is the reason that i said that i MIGHT do it.
Though this would again get something to the table since in an autoresolve only version you can't use the advantage of you being a human, and the AI being dumb.