I suppose that the decision of how much honey to take/leave is a tough one, but that decision is never the less the factor for kept honey bees.
I also suppose hive placement after hibernation would be a factor. I'm not informed on beekeeping, but I wonder if the hives could not be placed inside barns or packed in straw to help insulate in the heat. I know that insulated livestock waterers take remarkably little heat to keep from freezing.
Bees do not freeze as if they have enough food they will keep temperature inside the hive at 90 degrees. There beehives in Alaska and way up north in Canada that survive winter.