Have you thought about making your own pcb's using a 3D printer? If you don't have a 3D printer maybe you could partner up with someone who has one that would be willing. Ohhh, I don't know who but maybe the guy who's post is above this post might be interested. Baahhhhhh!
Wish it worked like that, but sadly no Milling PCBs also won't work on metal core substrate as you can't control the depth enough to not cut through the insulation material and into the metal core (though works fine for copper clad fiberglass).