OK, relevant response to the question.
When I read the first sentence of your opening statement...
"On JNC's "Short" hole thread, I loosely posited the concept of a "Middle" template hole."
I immediately thought that you meant a "Middle" template for a par 3. And to me, that is more interesting. I don't want to hijack the thread, but once you get to modern par 3.5 size, there's lots of room for variation.
Eden and Redan are specialized "Middle" holes. Perhaps "Redan" is the stereotypical "Middle" hole. But it's pretty specialized.
I say there's room to suggest a template for "Middle" par 3 style. Give me a mid-iron or fairway wood hole with a big front right bunker and a large, kidney-shaped green that wraps around the bunker, and slopes consistently from back to front. Make back left the highest point on the green, so there's a side slope to work with. Long left is dead. No water or other hazards anywhere to be found.
Or you can build a reverse "Middle". That's my template suggestion.