Where Afrika Korps troops might go without a North African campaign

If the Allies controlled all of North Africa by 1940, where might troops otherwise assigned to Afrika Korps go?

They would most likely reinforce Operation Barbarossa, with a Middle Eastern route through Turkey another possibility.

Troops no longer required for North Africa would likely be redirected rather than left idle. The clearest destination is Operation Barbarossa, where Germany could add them to the invasion of the Soviet Union. In an earlier version of the answer he also raises operations toward the Middle East through Turkey. The exchange changes force allocation, but it does not by itself establish that either alternative campaign would succeed.