In the earlier post with the reply from the operator, they used the term inverse DIN, that would be a way to descrive the standard Drager tank valve.
That's why I figured the 1073 was backwards.
Not sure how much room there is to work with, but if there's enough, check the 1075/int adapter.
It makes the Drager tank valve a yoke style tank valve, and then you could use a common DIN to yoke adapter to attach your regs.
http://www.subaqua-products.co.uk/Ca.../catalogue.php
Type in 1075
Darlene