OK, I saw one once, for some reason I remember her calling it a 'tongue' quilt. I googled it, but came up empty so maybe I am not remembering the name correctly. Your referring to a shoe horn shape sounds right. They were about 3" long, and about 2" wide and curved on the end. 2 pieces of fabric, then turned, seems to me, no batting, attached to the edge of the quilt, then a narrow facing applied to the back. I'd just make a few and come up with a pleasing size & go for it. Don't remember how she handled the corners...

Sorry I can't help with your question about the edging, but I wanted to tell you that I really love your quilt and how you set your Laurel Burch fabric blocks. It's so clever. Thanks for sharing. I hope you find an answer to your question.

Never saw prairie points referred to as "jagged edge".....

Those aren't really prairie points because they are produced differently, but they end up looking like prairie points in shape. The different colored fabrics would make them look different than prairie points.