Bees really go after granulated sugar mixed with honey into a patty form. No need to turn the sugar into powder first unless you really like to make a mess.
OH I like that idea even better. Although it might be a tasty finger licking mess, one less mess is good.
I am planning to divvy up the honey stores to get both my hives through, having a plan for feeding late winter should I need to is a good thing.
With SBB it is a bit difficult to pour dry sugar on the bottom board. Might work on the top cover. The winter temps fluctuate wildly here. We often get days warm enough that not only the bees can stretch their wings/legs, but so can the fire ants.