Also, we know that some German Jews were indeed deported into the occupied Soviet territories (Riga & Minsk), without the rail changeover deal that you are alleging took place at the AR camps.
Do you have source reference for this? (I'm quite certain it is true; - it is just that I would appreciate a reputable source reference.) And do we have any information as to when they were deported and what their ultimate fate was? I note here a possibly connected report in Robert Conquest's book "The Arctic Death Camps" of German Jews held in an isolated camp in Kolyma, on the Pacific side of the former Soviet Union.