Background: I am trying to create a "teammate standby" quest that allows dismissed followers to hang around the current cell until re-recruited, on request via dialog, ie "please hang out here indefinitely." The idea is to gather followers together so that one doesn't have to go hunting for them all over the map.
The desired behaviour is to have the NPC enter sandbox mode within the current cell indefinitely (until overridden by player dialogue), overriding all other AI packages. From what I understand, the easiest way to do this is to assign them to a quest alias, but it seems a quest alias can only be assigned to a single reference at a time.
So how would I override the behaviour of a number of NPCs like this? Assuming I've added them to a "TeammatesStandingBy" faction, I would like to override the behaviour for everyone in this faction without having to explicitly add the package to each possible follower's package list manually.
Any guidance appreciated. I apologize for lack of clarity, or if I've asked a particularly stupid question.
EDIT: To be precise - all I want is a way to add a behavior package to a set of NPCs dynamically. If it will make it easier, I will add the NPCs to a faction at runtime. Is there a way to do this?

