So planting is option #1.
is there an option #2 ? I just don’t have the space, time, or resources to protect every tree. Could just be 50 rootstocks was a bit aggressive and I will have to take some losses.
Window screen the trunks of each at least above some lower buds above any grafts; Heel them in the ground (in pots), in a bunching; Rabbit screen the lot.... Pull pots when you want to plant next year - done deal. Same as above advice. I do 50 to a hundred per year that way. Your protected from the cold and from the critters. If you like paint the trunks white.