We've been caging virgins and putting them into a large zip-lock bag, then gassing them, in the field. The gas pressure must be very gradual--I've managed to "pop" a few queens with too high a pressure. Not good . Always learning with apiculture/beekeeping!
Yes. Also, once the virgins emerge, and the cages are sealed, we move them from the incubator to a cabinet with 70-75 degrees F temp. They are much happier with that temperature. The cages have queen candy in 'em, of course and they get honey and water twice a day.Virgins fade really quickly in an incubator if unattended so it seems really smart to add a few bees to a cage like you have.