By odd chance I happened to have just finished responding to another question that had a very similar potential solution, so I hope you don't mind if my response below is a little cut-and-pastely.
Because each enemy is comprised of a collection of unique object types, (some for the image and some for the detectors), you might be able to use the "Containers" feature of Construct 2, to associate all the objects of an enemy.
Each enemy would get it's own set of detectors that would be automatically contextually picked whenever the parent enemy is picked, and vice versa.
Containers will work as long as an enemy only needs one of each object type.
For instance, if an enemy has a body and two ledge detectors, all as separate objects, then you'd need the ledge detectors to each be unique objects (e.g. leftLedgeObj, rightLedgeObj), as you can't put the same object (e.g. ledgeObj) in a Container twice. At least not to my knowledge.
Containers page of Scirra's C2 Manual