Just an update on this and some info for anybody who might be looking to do this.
Airgas was not helpful and had no idea what I was talking about. However I was able to put my two regulators together using tape thread wrenches and this part from ChiCompany (those guys are awesome btw and were very helpful over the phone):
So with a $3.66 cent part and very low shipping cost I was able to convert two old regulators into a dual body regulator and save myself $150. I then created double and triple valve manifolds out of brass plumbing and hooked them up in sequence (saving another $100 or so)... Saison is pouring and the stout is carbonating successfully at two different pressures. Thanks again to all the people that posted on here.
You can see the regulator behind the top of the corny keg and a little bit of the manifold to the left of the keg.