They are indeed resiliant, but I've had a few get some weird things going on due to a temp swing. Some non-genetic pattern variations, as well as cone-heads. Cone-heads happen when the temps spike, I believe.
Like I said, I personally would not risk it, and would build a 2nd incubator (Can be made on the really cheap with some water, aquarium heater, and a styro box)
But that's just me!