Hi Dave,
My friend Mark is happy to explore the idea. He thinks off the top of his head, that a material called PA12 with added carbon fibre would do the trick.
He would need a good drawing and pictures of course.
I suggest in the first instance you email him at sales@morgan-gadgets.com (a site he set up for the satnav clips), I've set the scene so he will know what you are talking about.
Just must mention that he would be doing it as a favour to the Morgan community, charging only to cover his costs. 3D printing is just a hobby, not his source of income. So he can't promise to do it but it's worth exploring.
Nick