Same as others I think.
You dont want to play games with all the indepts on full AI. Ive playd those and they are impossible.
I suppose you could duplicate it. But then we are back to the mod idea. Id definetly recommend breaking the map up into many different groups of indepts. Otherwise it marches across the map bringing along everything in every province it passes thru. Not good.
Well you could get a quick taste of it by map-commanding ownership of every province to a nation. Give them all to Ulm, then add Ulm as an AI. But its awful rough.