I looked it up for you: It is very similar to the flange, depends on width of strips used.
http://www.instructables.com/id/Two-Tone-Quilt-Binding
But if you have scalloped edges, you probably are doing bias binding. Can you do a second row of stitches on the inside part of the binding to secure then trim a scant off the batting? That might give you the little bit of room that you need to turn it. You could try a little of the cut off binding on a sample to see if it would work before you cut the quilt.