just to confirm this is impossible...
activator with EditorMarker.nif and script. script gets
set posX to GetPos X
set posY to GetPos Y
set posZ to GetPos Z
set posR to GetAngle Z
npc_id->PositionCell posX posY posZ posR "exterior cell"
since posR needs to be min, i also tested "posX posY posZ 0" and "set posR to 0"
PlaceItem works fine, hoped positioncell would too. to not have to edit scripts for a moved version of my mod...
using numbers works fine obviously.