How about sewing in the top "hem" of those pincushion/scrapbags to hold the scrapbag open? (I use strapping from newspaper bundles in mine).
Or, would it work for corset stays? I saw a post by a Craftster that used zip ties for stays... your stuff looks pretty flexible, though, so it might not hold its shape well enough.
Good luck, and don't forget to post pictures of how you use it.