There are ways of doing anything, if you hack it in or make it extremely un-performant. The case here would be having to check every single party on the map to see when they went to one of these locations, then deciding what to do with them.
It would take a lot of work to make it work right. ACoK does not have a proper North of the Wall, where parties can roam freely between the two. They are completely separated and i guess the option to not pass is only for the player. This is the easy part and can be done in about 15 mins of coding. The hard part is working out where all the Ai for travel is for the NPC parties, finding out when they get to certain locations, then deciding what to do with them, or how.
Imo, its not worth the effort, or decrease in performance for the mod to make this achievable.