IMHO the "Germanization/Aryanization" process would be relatively short lived. Taking very young children who were deemed "Aryan" for adoption means that they grow up "German" no accent, and thinking of themselves as "German". Adults who fit racial criteria, and who had skills that were desired could be "Aryanized", this happened OTL. Over a certain age children will retain memories, accents, and so forth and also their adoptive parents will realize they are not "German" orphans. Once the initial sorting has been done, Untermensch slaves will have no skills making them worthy of Aryan status, and slave children are unlikely to be "adopted". What this all means is that those in the east who will be "elevated" in status either my fiat or by adoption will be selected relatively early on and the lines between Aryan and slave Untermenschen will harden. One possible exception to this would be some sort of ongoing variation of the Lebensborn program, where young Aryan women were impregnated by SS men to increase Aryans (among other functions of the program). Taking not only western "Aryan" women for this program but also Slavic women who met criteria could continue for quite some time.
All of this stuff either happened OTL or was planned. Just when you think you know the depths of depravity...
All of this stuff either happened OTL or was planned. Just when you think you know the depths of depravity...