SN had a Ford Transponder Key where the plastic keeps breaking. They've lost the key several times now due to the key chain hole being broken off.
We created a sheath to clam shell around the key and, 3D printed it in fluorescent orange PETG.
The key was then glued into place and the clam shell glued shut.
We did find that the clearance between the key and the ignition switch was too small and, SN will use a dremel tool to widen or remove the switch "wings".