After sleeping on it
and thinking about it
I've decided to just go into Reavis and directly back out. This kind of mileage in a day and a half, although humanly possible, would be unpleasant. The factor of hiking in the dark, unfamiliar trails, numerous creek crossings, possible boulder hopping makes this a hump-and-a-half that would take probably longer than I figured. I'm just going into Reavis Ranch and back out.
I'll do this hike some other time when I can take Sunday also. Doing the original hike in 2 1/2 days is much more reasonable.