Allow CustomPropertyN to be Set via Trigger

Can a trigger rule be added to allow Session.CustomProertyN to be updated via Event.Data?

A working example we are trying to achieve is to set the CustomProperty7 to the file version of a software package to allow Access Sessions to be filtered automatically upon the software package being updated. Using the current tools we can script via Session events getting the file version and adding it as a note but it would be good to add be able to set this event.data to be returned to the CustomProperty.