I've only tested this on allianceside.
1. Run to a tower where no alliance is close.
2. Cap the tower.
3. Get out of combat. (Feign Death, Invisibility, Vanish or just run away from the tower).
4. If you've done it right, the npc's should despawn when you get out of combat, if there isn't anyone else near putting them in combat.
Can make a movie if requested.