I think I might go with unlined Oil Tan. I saw a guy with black oil tans last year, they were three years old and well worn and they really looked fabulous.I'd also probably go with a natural edge -- it looks great against black I think-- but that's just a personal preference.
^^ Says on their Instagram that they were custom made for a customer. There's a couple of other pics of them there. Made with 10 oz. CXL. Looks like a 360 welt. Kind of a too-straight back (reminiscent of an Iron Ranger) and a bit of a clown toe, but definitely has potential for a 6" boot version.
Here are a few pics, both with new leather. But what you really want are some pics with worn leather, which is indeed hard to find. I seem to remember a pair posted by a guy here about a year and a few months ago (though now I can't find them), and the wear really did not look great. Very crease-y in a sort amount of time. It convinced me not to order a pair in HH: