I get tired of asking these "will this work" questions but where I live I'd have to drive 40 miles to ask this question of a knowledgeable local source. Anyway, I have a surplus regulator which I've used for some time on a CO2 tank (plumbed in via an adapter) but which has a connector which threads correctly to e.g. an argon tank. It is a pressure regulator, though, not a flowmeter, and I want to use this in GMAW. So I got an Airco flowmeter, removed it's weird POL-like connector, bushed down the 1/4NPT to 1/8NPTF and put a 2½" 1/8" nipple, and just threaded that into the flowmeter:
Grant Erwin Kirkland, Washington