Commercial comforters usually have thick polyester batting. Thick polyester batting is difficult to quilt on a home machine. Tying could be an option, except the ties have to be very close for a polyester batting in order for the batting to not ball up in the wash.
My suggestion would be to use Hobbs 80/20 batting, which has a nice loft and is soft, but which is easy to quilt on a home machine. Quilter's Dream probably also has some polyester batting that would be easy to quilt at home.
The re-done quilt might not look exactly the same as the original, but (in my opinion, anyway) could look even better. I think you would be unhappy with the end look of a commercial batting; industrial machines are set up specifically to handle that type of batting. I doubt you could get the same effect on a home machine.