Option: create a map with a default AI player that cannot be claimed by a human. The AI player has 50%+ of the stars and dominated the middle of the map. The players starts on the fringes. Victory is as normal.
Reasons: My friends and I are generally the cooperative sort. We have discussed puposefully manipulating a map and a player so that the conquer a LOT of stars, then they quit on purpose to create a massive AI the other players band together to fight.
It would be a bit like Blight style game play with Triton’s mechanics.