I am a novice, so please take my idea with a grain of salt. If the hive has two entrances, perhaps you could use one of those chemicals used in harvest that the bees absolutely hate the smell of [The chem is used to drive the bees out of supers]. Pump some of the stuff in the lower entrance, and if they hate it enough, maybe they'll abscond and get outta there. Or maybe the upper entrance would work better for the chem, IDK, but I just thought I would share my idea...