I think the rule's it's quite clear what's supposed to be tested and how, but be totally honest there's only a select few that can afford to do that.
My other concern would be that any certification would be invalid legally as it's used in an combat situation where a slight dent by a spike or axe that has no ill effects would deem it not safe for use in a commercial environment.

That being said, my personal opinion is that the main CO2 bottles need to be off the shelf and always in good condition as they do now, but the custom parts after the bottle/regulator should not need full certification. Obviously we need to keep a close eye on things so that people aren't being stupid with material thicknesses etc - but that's no different to how things are at the moment.
The arena's are built to take any misshap's with these sorts of systems.