a couple of ideas...
first - they now sell magnetic hanger systems for quilts that would replace the need for the wire
next...have you thought about putting the quilt on a stretcher frame and hanging it like a picture? You could add a band of fabric to the back of the quilt by stitching in the ditch at the edge of the binding. Then find an artist stretcher frame at Joann's or Hancocks or Michaels and after centering the quilt on the front, staple it in place on the frame through the fabric band you stapled on...this will help ensure that the quilt itself is not damaged and will be kept taut and square while hanging. If you need help in the stretching, spritz the quilt so it works with you then it will tighten up as it dries in place.
...as a variation to the previous idea, you might purchase a stretched canvas on a frame that is big enough for the quilt to be stitched to the canvas - before you stitch it on, paint the canvas a complimentary color.
...or even have the framing department at Joann's frame it for you..that way they do the hard work of stretching, and centering.