I did the BW400 a couple times last year, but starting at Coopers Rock and doing all the WV stuff to Canaan and back as a 200 mile day loop. I also did the Laurel Highlands bit down into WV several times as well as 200 mile day loops. All the bits are sorted out and been ridden multiple times. Still trying to add more dirt and less paved. Thinking about doing that stuff plus some of the TWVT next month with Chris. Maybe just a 3-day with a Spruce Knob / Laurel Fork loop in there.
BTW, Sand Spring road (from 857 up to the campground) is a nasty bit of real estate these days. Several miles of unrelenting ruts and rocks and you grind your way uphill. And the infamous Greenville-Sand Springs Rd (CR-2/3) is now private property / gated / posted out the wazoo at the campground end (Sand Springs Rd). The northern end of the road is open. Not sure where the posted bit starts (after bike swallowing mud holes?) but it's gated multiple times at the south end (campground).
So many good places to dual sport and so little vacation. That Black Hills ride does look worthy though. So does the Michigan dual sport stuff (lots of sand, ugh).