WillsC,
I would be planting some of the cold hardy extras in ground (roots 3 feet deep, below frost line). Then cover the resulting branches with insulation and a tarp outershell. I was able to get a potted Celeste in a 15 gallon container thru this past winter wrapped with only an old comforter and a tarp outer shell. It was exposed to the weather, and had minimal dieback.
I would think that with your mild winters, a simple outer layer (tarp) and insulating layer (burlap) would be sufficient protection.