Ways to save my temperature-ravaged Che graft?

Hey all, here's a unique issue:

We are barely in the temperature zone for Che trees (5b) and this past winter proved intolerable for the plant that we put in the ground this fall. It appears to have died back to the graft.... almost?

As you can see in the attachment, the rootstock (Osage Orange) has started to sprout some leaves, but there is no activity on the Che graft. It appears by colour, however, that part of the Che graft is still alive for an inch or so above the graft union. The way I see it, I think I have two options:

1. Let the Osage Orange grow so that in the late winter I can graft a new Che scion onto the plant

2. Somehow get the Che wood that still seems to be alive to bud.


In either case I'd get stronger roots my keeping this one in the ground and trying to work with it. I'm inclined to attempt to get the Che wood to keep growing and protect the tree to a much greater degree this coming winter... but how would I go about this? A lost cause or is there some technique I can try? Help would be greatly appreciated!