This is a timely question, as I just finished participating in the Dodo passaround. Sharpening the reverse-S blade was one of the evaluation objectives I set for myself.
I found that, due to the blade size, it was extremely difficult for me to follow the standard Sharpmaker method of keeping the blade edge perpendicular to the base. That method required that I tilt the knife up and down in a continuous motion. I ended up just starting with the back of the blade perpendicular to the base of the Sharpmaker, and pulling back without tilting the knife.
That method seemed to work for me, at least for touchup. However, I would like to hear from the experts as to other methods and, in particular, what would one do if the edge was badly damaged?
Thanks,
Matthew