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That would probably work better.
Definately make the AI a defender, possibly with lots of cloaked ships, WP, fighters, mines and sats to surprise the supriser.
Since it would be a scenario you could establish the victory conditions and get the AI in position to win if the human failed to attack and win the battles within a certain amount of turns.
Would this be a sort of "capture the flag(homeworld)" style scenario?
If everybody had a starting supply of 10million resources (stored on homeworld), you could make the goal be to reach and plague (or destroy with normal weapons) the enemy homeworld with a super expensive and large (700kt) level 6 plague bomb.
Your two or three "flag runner" plague ships would just have to reach point-black range with a homeworld to hit it and win the game.
Your fleet would have to clear the way using the sneak attack against your choice of empire, since the plague ships could be cut down easily.
Give everybody lots of shipyards that can build anything instantly, and give everybody a few turns to prepare before attacking and defending. The whole thing could be over in a year or two.