I think that the bottom line here is the stabilizer needs to adhere to the fabric you are sewing upon. I would use a heavy adhesive in this case so that the outside satin stitches will land exactly where they should. Heavy adhesive is about as stable as you can get. Make sure there is no slack between the fabric and stabilizer, which can happen.
When you did your 'test sew out,' did you have any movement of the fabric/design? It is possible for the design to have problems which you would have found during this test. A design like that would
be unsuitable for a patch because of the nature of the patch. In fact, I would consider that design to be a discard and unusable for anything.
You will be adding some sort of backing for the patch. You would probably not want to have a patch with stitches on the back for various reasons, not the least of which would be visibility of those stitches. If the patch is eventually attached via adhesive, sitches do not allow for a secure and even distribution of the glue and therefore not a good attachment.
Back the design with a heavy canvas type of fabric. Let us all know how this is coming along. Patches that are transferable would be an interesting accomplishment. I don't think I have ever seen one like that in the market place. Perhaps you need to consider doing several patches to be attached to those multiple places.
Pat
BTW: My latest blog does cover stabilizers and I hope you will check it out and let me know if you have further questions. Constructive critique is always welcome!
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