I wonder if you can spray the nooks and crannies with an insecticidal soap? They sell these potassium salt based soaps in garden stores (Wal-Mart and Home Depot carry them too), sometimes in concentrate form, sometimes in ready-to-use solutions. These soaps kill bugs by “melting away” their exterior exoskeletons and suffocating them, but are relatively non-toxic to humans. But you got to get the critters on contact to kill them. After you spray, you can flush the nooks and crannies with water, then heat up your oven to get rid of the remaining few that might have survived.