The problem is that *all* the propane regulators we've found so far are designed to attach to the hose by screw fitting. The hoses they sell to go with them (if you need one) has a screw fitting at each end. Mine has a push fit/jubilee clip fitting at each end of the hose. Some of the butane regulators we have seen have an adaptor sold with them that screws into the regulator which you then push the hose onto. None of the propane ones have these with them, and we have not found them sold separately despite pointing at them in butane regulator boxes and finding pictures of them online and showing them to DIY shop assistants. I am not confident trying to change the fitting of the gas hose where it joins the metal pipework. My guess is you'd have to weld a screw fit to it? But I know absolutely nothing about gas or plumbing.
I wish I could upload pics to help explain better but I've already used more than half this month's internet allowance. I will do if I can get wifi at some point x