I wondered the same as I do not like the look of bringing the binding to the front and machine stitching. I sew the flange to the front so it will peek out. Stitch far enough away to secure but so the stitching will not show. Then sew the binding as usual to turn to the back. The trick is getting the flange straight and even. I have not found a way to miter the flange. I think it looks ok though. Good luck! It is possible even though it isn’t standard procedure!