With a POD after Versailles treaty, switch the positions of France and Italy in the alliances, id est you must have an Axis France and an allied Italy by 1939.
You have complete freedom of action, you can alter the political situation of the two countries as you prefere, butterfly away wars and so on so forth, but you can't alter the main objectives for the contendants (so Hitler will still want lebensraum, Japan will stll desire China etc...). You can not also alter the compositions of the two alliances (No Axis Russia!).
Bonus points if France is not run by a fascist goverment.
Bonus points if Mussolini is still Duce.