If it is a full size quilt I wouldn't want to try to quilt it on my regular sewing machine. It will be heavy with a wool blanket as batting. I would also be hesitant for a modern domestic machine to quilt through 5 layers but a large cross hatch might be do- able? Maybe you can quilt the top and the back as you indicated and use it as a duvet cover for the wool blanket? You could then use some ties to hold it in place.