With an even heavier heart and tears in my eyes nerf pocket internals

[rulib]

I agree. The point is that they're not for extended use, its in the name: emergency. 
But dropping it from 1000 to 50 is rather absurd.
Having it at 500 kpa is far better. 500 kpa still lasts a considerable amount of time, while still can be weighed out.
An emergency vending machine is a great idea. But remember that general manufacturer serves the purpose to a degree.

I wonder how long 500 lasts on oxygen and on air, maybe the goal should be to have it last like 5 minutes or 10 minutes or something specific.