David, I too, am in a wheel chair and sew. My remendy for your quilt is to take apart each layer in that spot and rebuild it just like on a new quilt when an error has been made.It don't have to be perfect but look good yes. I would repair the top first. You got lots to consult with.
Cut new blocks the best you can and reattach them. Press.
Next reline it with as close as you can. Then replace the torn bottom layer with whatever color remains in the quilt.
Then had place the binding. Retye it and your back in business. I been there and did the above method. Lasted anothe 20 years.Need help you can contact me. ShirleyAnne