i think a direct air machine will kill anything once its in the bag, lots of negitive pressure, i used a simplicity canister to get rid of a infestation of pherroh ants (what a pain that was) never had one come back out of the bag, same thing with spiders and other ants.
what i would do is suck em up, leave the machine on and then suck up some plastic bb's to obliterate them, followed by boric acid, then thoroughly wash the nossle, hose and wand. (would not use a power nossle for this.) direct air machines could chew a bug to pieces, but there is a chance that it gets by without harm.