It must not be too big of a deal because if he came home with a mass of soggy dead bees, he'd stop vacuuming them, right? :)
A good vacuum calibrated correctly will not harm any more bees than a shake down will. Even with full bellies.
I vacuumed one last year that I couldn't get to move into a box (freezing nights, stupid bees?), and they came home just fine, I didn't notice any dead ones.
Rick