This is what I did today.
Fall bud graft works great in many areas. I know your area will be cold soon. You’d better try. No lose.
If your tree falls all leaves and went in dormancy, you can cut some scions and wrap with wet paper towel to store in the refrigerator. The longer you store the scions, the more energy they lose. I had some leftover scions and tried grafting in summer. None of them took.
You can also buy a potted apple tree from local nursery and bud graft. Then bring it into warm area and wait the wound healed.
Hope those ideas can help you.
Just cut off the leaves and put in the fridge as if they were dormant scions. They should graft fine in the spring. You could try grafting now as well like Sophia mentions - if it fails no biggie, do it in spring.