Okay, I came up with something new, to update this post.
A photo of a 12 volt MR16 socket, fresh from the electrical supply house on the other side of town:

(This photo was shot using the computer's built in camera)
The socket is ceramic, with a mica faceplate, and asbestos insulated leads. It is obviously meant to take high temperature, Though the LED MR16 is only 6.7 watts. The ceramic block actually says 250 volt 75 watts.

I can make a fixture out of a coca-cola can now.

Second item, The supply house now has a lot more variety of LED lighting, including an 8 degree beam angle version of the LED MR16. (The one I currently use is a 35 degree beam angle).

So I will soon have both the wide and narrow beam lights.