[jhayward]

You would need a overpressure relief valve, not a regulator. And it's not clear to me what you would do with the overpressure except either (a) block it to protect internal systems, leaving the externals to fend for themselves, or (b) flare it off via a rooftop vent system, which would be quite hazardous and unwieldy to maintain.

[sleepybrett]

but who doesn't want a flamethrower mounted to their roof?