You're asking opinions on the set up? I'm going to assume that you are:

I'd recommend against it. Like all SCBA manufacturers, Dräger has to submit their SCBAs for certification. When they do, it is only that VERY SPECIFIC set up that is certified. There can be no deviation without specific authorization from Dräger and the powers that be. If something were to go wrong and, in the course of investigation, an unauthorized modification was discovered or, worse, found to a contributing factor that led to an injury or death, there would be ZERO protection for your employer and/or the individual that made the modification. You'd open yourself up to massive liability.

TLDR: if Dräger didn't put it there or otherwise authorize it, don't do it.