Kodak has published on its web site, several formulas with DTOD instead of thiocyanate. The VNF process is one that comes to mind (IIRC). I would say 1 g is enough.
As for the sulfite, about 10 g/l should work. It reacts with excess CD3 to form the sulfonate (ahahahahaha) to prevent stain from forming.
Sulfite is everywhere in photography. Like cow patties in a pasture, right?