I am going to add my 2 cents to this conundrum. I don't think I have the answer, but some thoughts.
1. We can't control the weather. I found myself in the same situation this fall. Winter came about a month and half early. Surprise!
2. No need to worry about SHB or wax moths in the supers. That good hard freeze killed eggs and the SHB probably moved down with the cluster.
3. You can shuffle honey super frames into hive bodies. This works well if you are using deep supers. Shallow supers leave undesirable empty space with in the brood box. When the early nectar flow starts, they will build comb on the bottom of the shallow frame.
4. You could remove any queen excluders and put honey supers on top of light colonies. After winter equinox the queen have moved up with the cluster and will start laying again. She could lay eggs in the super. I find this very undesirable, but better than losing a colony to starvation.
5. Combining colonies would be difficult as they are clustered. The cluster might be located in both brood boxes. You might chill the queens, workers, and any brood that might be in there. (We don't know the exact date of this scenario, but late fall is usually broodless.) The location of the cluster is critical here. If they are already at the top of the brood boxes, they are out of food.
6. If combining, there is no guarantee the best queen will survive. Someone mentioned that doing a combine will not benefit the cluster on top. In a clustered state, this is true.
7. If you need to harvest that honey you will have to warm those frames up first. Your going on vacation, so you aren't going to harvest right away. If you don't have time to feed them sugar in some form, you certainly don't have time to extract honey.
8. The honey supers need to be pulled and not left on all winter, especially if you have queen excluders on.
9. No one has mentioned winter patties, and that's good. Winter patties is not emergency food to prevent starvation.
Given Rat's hypothetical scenario of the
totally caught off guard beekeeper that doesn't want to use the mountain camp method and hasn't prepared sugar bricks, I would remove the queen excluder and place honey supers on top of light colonies. If the beekeeper does nothing, when he returns from vacation, those hives
might still be alive.
He or she could get lucky. Then he could put some fondant, mountain camp method or sugar bricks on any surviving colonies.
I think I have spent my 2 cents.