I may make a rule change where italy can be attacked by the allies immediately after the turn germany takes paris or is at war with russia. This may keep italy at bay enough for the allies at the start of the game. This needs to be play tested.
Global war 1939 expansion set
Do you need to buy, apart from the map, the expansion set as well in order to play global war 1939? it is quite expensive and I do not want to invest another 200 dollars before I know whether I like the game or not. Or can you manage with the 1940 standard editions and perhaps some additional 1914 units?
If you have a copy each of Europe '40 and Pacific '40, as well as a copy of 1914, you should have enough pieces to be able to pull it off. Personally, I use the British from 1914 for Chinese Nationalist pieces, and the Turks as Chinese Communists. You can use the 1914 Germans as Axis minors, and the French as Vichy.