Why can' t you wait for the wind to blow in the right direction so you can hunt the downwind side of the N/S part of ther funnel? It sounds to me like and east or west wind would work, depending on which side of the trail you can sit on. If hunting a south wind, deer would be fine until they continued along the trail past you. Then they might wind you once they get downwind.
It' s hard to say without being there, but it doesn' t sound that bad to me. The hot section of the funnel sounds huntable with an east or west wind.

If that' s not possible, you might be okay sitting on the west side of the trail with a west wind. If you' re 15 yards from the trail, sitting 20 feet high(I don' t think I' d sit much lower in this case), your scent might blow over the top of the deer. If you' re careful about washing your clothes, and not getting hot and sweaty when entering the woods you might be able to pull it off. That situation isn' t ideal, but I' ve had deer downwind and fairly close not smell me before, and I don' t use special clothes. I just make sure everything is clean and non scented.
Good luck, it sounds like a good spot if you can fool their noses.

peashooter