Tbf it would take AGES to do, in a whole Free-for-all game you could only do (with hardline):
Attack Helicopter (6 kills so far)
Pave Low (8 kills so far)
Chopper Gunner (10 kills so far)
-Die
Attack Helicopter (16 kills so far)
Pave Low (18 kills so far)
Chopper Gunner (20 kills so far)
-Die
Attack Helicopter (26 kills so far)
Pave Low (28 kills so far)
So you could only do 8 a game (and you'd have to shoot down every single one before it got a kill)
1000 divided by 8? - 125 Free-for-all games.
125 times 10 minutes? - 1250 minutes, that's 20 hours of work.
20 hours of work for prestige hack? I don't think so mate