A thought on your minus. There is a LP adapter for these. I just would tell you not to bother. The way the little adapter that you hold up to the tank is designed... You are not setting a flow rate by "cracking" the valve. You're just getting some gas there. There is a tiny little hole in the end, and larger ones around the side. See the problem is if you pressurize the nitrox into a sensor, then the reading will vary. I've tried this at varying flow rates out of the valve, and it really does not make any difference. Still will read the same.
And personally, I want to know what is in the tank before I go to all the effort of hooking up my gear to it. Many times I'm grabbing a tank at a shop, and my gear is down at the dock. So then a small hand held analyzer that doesn't require a reg is more practical.