[Suicide Junkie]

First, you should temporarily change your mod so that mineral miners produce 100000 per turn, engines provide 30 movement, and research facilities produce 1000000 points. Add a zero to the SYs so they build colony ships instantly.

Vroom and zoom, nothing will take very long.
When you're done, set the numbers back to normal.

If only the guardians are AIs, you could set the MEE point to 0%. Since everybody still alive has more than 0% of the 2nd player's score, they should all be declared MEE.