100 to 200 bees per colony. Second week of January. Hold on...I'm going to see if there is a grim-reaper smiley to use before I go any further.... :deadhorse:
I admire your efforts, and I would probably try everything I could also. But this sounds like a lost cause. For a couple of colonies with 100-200 hundred bees each, to even raise brood, will take months, without any setbacks.
I think you have a better chance IF you combine them, and even then, this may not be enough.
PS....winter loss, is best taken in the fall, through culling, combining, etc.