Assuming the war is won as described, the number of Einsatzgruppen would actually decline. Once the boundaries of German control were established, it would be more a matter of rounding up any surviving Jews, Roma, and whoever else was scheduled for immediate elimination and sending them to camps like Auschwitz where they could be adequately "processed". Those shot by the Einsatzgruppen did not have their clothes, hidden jewels/money, and dental gold "harvested" and thus represented a financial loss. By the time the war is won the extermination camps are established and working smoothly. It is simply a matter of rounding up any of the Untermenschen who have not yet been deported or have escaped the net and shipping them - no need for major shootings (like Babi Yar). Sure there will be some shootings of isolated small groups or individuals, but not like the early days in the USSR.
For the Slavs being worked to death or allowed to starve, SS men assigned to such duty, probably on a rotational basis would serve. Other than troublemakers executed locally, probably publicly and gruesomely as an example, there would not be deportation to the camps. Eventually the camps, like the Einsatzgruppen would be downsized. Of course there would be concentration camps for punishment, but once the "portable" populations singled out for extermination (Jews and Roma primarily) the need for a large extermination apparatus is no longer needed. There will be millions yet to die, but they (mostly Slavs) will die in place.