This might be considered quilting heresy, but why can't we just fold the backing over and bind with that? It takes me as long to mchine bind a quilt as it does to free motion quilt it. I'd much rather spend my time piecing and quilting rather than binding. The last one I did I double folded the backing so the edge tucked under the batting on front, folded it again and that gave me a double thickness on the edge (hard to explain). It worked like a charm and from the front it's not possible to tell it wasn't actual binding.
Please don't send the quilt police after me for saying this!