Pressure regulate tank output

I did a search and didn’t find anything about regulating the output of a scuba or scba tank. I was wondering about putting a adjustable regulator and a easy to read gauge on my scuba tank set to the fill pressure I want (1550 psi). Thinking that no matter who fills the gun it is at the right pressure. Plus nobody could over fill the gun. We use adjustable regulators on our propane burners for making maple syrup so we can hold optimum pressure as temperatures change to keep the burners at maximum efficiency. Pretty simple set up. Has this idea been tried and failed miserably or easy to buy and I just missed it. Ninja bottles have regulators this would just be on a much bigger scale. I’d still use the tank valve to open and close so it could be done slowly. Then bleed line as normal.