Mark I dont think Schefflera delavayi would be hardy for me or any Schefflera but I do have a Schefflera arboricola that I dig up around Thanksgiving and plant back out around Easter. It was just a potted plant but I do Sago that way and thought, why not. I will post a pic of it soon.
One plant also about that time that people were planting was Fatsia japonica and I have one that has survived this vortex. I did as Fred suggested by throwing a tarp over it during cold winds etc.
I will post a pic soon friend.
I know I keep saying soon, trying to get over an operation