AutoCad :: Explode Blocks After Insertion?

I working with a LISP program which creates some assembly drawings on the fly. For certain parts of the drawing I INSERT other dwg files which of course become blocks. Once in the drawing the users are sometimes wanting to edit the drawings where the blocks are, which makes an explodeable block necessary. But since the drawings are not actually blocks until they are imported this is not an easy thing to resolve. The other thing to keep in mind is that this drawing process is completely automated. The user does not get a chance to interface with it until the drawing is complete. So asking the user to do something as the drawing is being created will not work.