The chances of a hose rupturing is very small and usually they go when pressure is first applied i.e. when you are there , so IMO it's really not necessary and if a gas pipe downstream of the regulator fails , the regulator will limit the flow and it is unlikely to trigger the unit. A pressure gauge is more susceptible to failure. So you are introducing another potential leakage point( joint and gauge).The gas locker is designed so that in the event of a gas leak , there are no sources of ignition in it ( unless you insert one, gas torch , camping lantern spare battery e.t.c) and the gas drops allow the escaped gas to dissipate. I got one as I have to perform letby testing and 1/3 of Calor gas bottle valves leak, so I thought I could isolate the bottle , but only a rush of gas will switch it off , you can only reset by pressing the pressure gauge , so it sits in my gas equipment toolbox gathering dust.