When I play single player games it never makes it to the modern era so I can't vouch for the UN diplo victory not having effect, but I know the AP victory has no effect. Either someone could test the UN or you guys could just not build it if the game goes that far. I'd find that preferable to not having the AP as a build option if I was playing.
Played: Pitboss 18 - Kublai Khan of Germany Somalia | Pitboss 11 - De Gaulle of Byzantium | Pitboss 8 - Churchill of Portugal | PB7 - Mao of Native America | PBEM29 Greens - Mao of Babylon