I have won before by having Germany march down to India, but not through Turkey. Push the Russians back to Moscow then go down the middle east. The Allies think you are going for Egypt, and maybe you are. You make more money this way than attacking neutrals. Do it just right and the allies spend mountains of cash defending Egypt, but then you turn left at Persia while Japan intimidates Hawaii.
Plausible but all cheesey gambits, the clock starts to run out on you as soon as the enemy figures out what you are doing. If your enemy has seen the gambit before, they will know what you are up to and will figure out a loophole.
To repeat what Cow was mooing, USA bombers can go to New Zealand then calcutta in 2 turns.