Well, there are perhaps two ways that can happen early enough for it to matter:
1. Build a carrier and two transports on G1. On G2, move to sea zone 91 and take Gibraltar and Morocco), but you had better make sure that the UK can’t kill you in that sea zone (Italy had better own Algeria, meaning only UK naval units and start bombers can hit you). On G3, move to sea zone 82 and accomplish landings in Gold Coast, Nigeria, and French West Africa. On G4, amphibiously assault South Africa.
2. On G1, take Southern France. On G2, build a carrier and two transports in sea zone 93 and move sufficient forces to fill the transports to Southern France. On I2, Italy takes Gibraltar to secure passage for your fleet. On G3, move to sea zone 87 and land in French West Africa. On G4, move to sea zone 82 taking Gold Coast and Nigeria amphibiously. On G5, land in South Africa. If they’re alive, your remaining German naval units could join up with the new fleet in the Atlantic or you could hit South Africa in two waves.
The first one requires eliminating landing zones for UK aircraft that can hit sea zone 91, which requires some commitment from Italy. The second one requires much less help from Italy
Both of these require you to be able to go into the Atlantic without being threatened by the UK and US fleets. If you eliminated most of the UK fleet on G1 and the US is not yet at war, this is easy. Otherwise, not so much.
Both of these are incredibly obvious. The first gives the UK less time to prep, but the second is a bit less expected by the UK and South Africa is more likely to be weak. On the other hand, your landing force is also weaker by two ground units.
Either way you’ve taken two planes, four to six ground units, and 30 IPCs out of any attack against Russia.
A third option would be a Sea Lion build on G2, but you ignore the UK and basically do the first plan with a massive amount of transports. South Africa will surely die, but Germany will die later because so much money was spent taking Africa.
Marsh