I'm afraid you couldn't be farther from an identification. The problem with Dasa identification is that they are simply generic terms for the enemies of the Aryans. As far as BMAC goes, that is smack in the middle of Indo Iranian territory whether you look, at hydronyms, toponyms, fire worship, or any of the other major Indo Iranian religious attributes. You could not have picked a territory more close to the Indo Iranian nexus. In order to resolve this matter of generic terms we could consider ethnicities that have been referred to as Dasa in the later Hindu scripture although this might not be the most chronologically convergent method. Scythians and Greeks have been referred to as Dasas in the Mahabharata and while the second millenium BC is a little too early for Greeks to be anywhere near the subcontinent or Central Asia, pre Scythian kurgans are a good candidate for the Dasa enemies as there is some evidence in the Rig Veda to suggest a shamanistic pagan affiliation of the Dasas which would fit quite neatly with the pagans of southern Russia, Kazakhstan and the Urals. Dasas were also not called goddess worshipers in the Rig Veda. They were simply termed as godless and not following Aryan forms of ritual like fire worship and soma offering, two things that Sarianidi has made a case for in identifying the Bactria Margiana Archaeological Complex with Indo Iranians. However all said and done it is extremely difficult to identify the dasa ethnicity although some groups are closer to the description than others