The effect of the partisans was heavily overstated in Soviet propaganda:
http://www.hsozkult.de/publicationreview/id/rezbuecher-14304
The Hunger Plan would effectively stop the guerrilla resistance in its tracks once it lost outside support from the Soviets; genocide as a strategy works when you have no morals, because the starving lack the ability to fight back.
Scorched earth would be a problem, but Maykop oil was expected to be back in significant production by early 1943 and the Don Basin was in production from 1941 on. Finland still in the war means a continuing supply of nickel, as does holding the Don Basin, and Turkey and Spain are probably going to keep selling to Germany due to fear of a pretty powerful Germany by TTL 1944 when they stopped IOTL.
Without air losses in the East, little need to focus resources to replace combat losses of ground equipment in the East, plus more resources captured and held in the East that's a pretty huge surplus of resources, especially without fuel expenditures in the East that would enable Luftwaffe training to expand instead of contract like IOTL.