I have to disagree. Whilst individuals in the PADI organisation object to the equipment, they are just individuals.
I've taught OW to students who wear a BP/W, have a long hose etc... and have done so with PADI's blessing.
I've also developed courses that mandate a long hose etc, and they have been approved by PADI (e.g.
Advanced Wreck Diver).
The reality is, PADI as an organisation doesn't give a rats ar$e about what you do or how you do it - if the course is safe, is "distinctive" (i.e. doesn't detract from existing courses) and generates them revenue and brand equity, then they will approve the course.
I've been toying with writing a PADI DIR specialty, just for the hell of it - it would probably take me about 2-3 weeks to do..... hell, PADI (not DSAT) have approved "full cave" distinctive specailties. I'd be willing to wager that they'd accept a team diver course.