Maybe this would work mid-mission -
Let's say you have a group of armed civilians. To put them on the west side at the start of a mission, you group them to a high-ranking west unit, and then put "deleteVehicle this" into the west unit's init line.
It might (and I've never tried this) work mid-mission if you call a little script at the right moment that uses createUnit to make a high-ranking east unit who is in the same group as the civilians, kind of like:
"soldierEB" createUnit [getpos near_civvies, civvies, "deleteVehicle this" ,"COLONEL"]
Hope that helps,
Ade