OK, I'm slowly resolving all the little "nits" from my nitpick list.
One of these was the lack of a sunglasses holder. I bought this Superior Essentials brand sunglasses clip which was made to clip onto the visor. It also has an attachment to turn it into a vent mounted holder, which I won't be using. The key was to find something with enough surface area for the double side tape, but not too big as to be obstructive.
I removed the metal clip and ground the back nub to make the entire thing flat. Then I applied a layer of 3M VHB 5952 double sided tape to the back of the holder and mounted it at the overhead console where the map lights are located, right between what appears to be two microphone vents.