Rita, (am I too late, you already have your solution?)
In the book "Stitched Raw Edge Appliqué" by Sue Nickels and Pat Holly, in the "Finished edge" section, there are instructions to add looping to binding strips, but it could very well be replaced by prairie points. I do not want to scan the whole section, but here is a picture of the general idea:
the Prairie points could be "enclosed" between 2 layers of binding (for each of the front and back).
Andrée