Sortie
has some objectives that give 100-500 points each and are not difficult to do or take much time.
Things like "Open any unlocked gate in area A". These also give KIs that let you use the portals to go downstairs or go fight the boss (you don't have to fight them).
You also get points from killing any mob, more for downstairs mobs. Just doing the easy objectives will net anything from 2-4k ish.
The run around the zone at the start to get all the KIs nets about 3-4k and has very little killing involved.
Here is a nice video for getting all the warp KIs.
YouTube Video Placeholder