I'm sure you could find a machine shop that would fab one up for you for ~30 bucks.
A CGA320 nut and nipple?
It won't be a problem. The problem now is figuring out what valve is on the cylinder. It has CGA320 stamped on it but the stores say it is unlike any CGA320 valve they have seen (which is not to say much about their experience)
So I have to figure out what is it since they do not know. They also told me they cannot change the valve on the cylinder to a CGA320 one but I am sure they said that so they can sell me a new cylinder instead.
I checked the PDF you linked to which is mighty helpful but I cannot identify what is on the the cylinder.
Any ideas at all? I'm quite desperate.
Or should I just bypass it all and have a machine shop fabricate a nut/nipple that would fit the cylinder as it is? One shop told me he would decrease the diameter of the British standard fitting already on the regulator. However, would the decreased wall diameter of the fitting cause any issues?
Nobody over here has any idea and I would really hate to deal with metal failure at 1000+ psi.