Diesal, It's a good timeline but WHERE is the new rifle that you introduced at the beginning of the story but as far as I can see has not made a bit of difference?
It's nearly 20 years old now but go to http://www.letterstime.com/ and see how Jim wrote it could be done but sadly without an ending. It's a great read and you'll throughly enjoy it.
If ITALY is neutral then Sicily, Rhodes, Greece (Crete) and the Balkans are no go. You can attack the Vichy French colonies but will add another enemy to your list. Denmark and the low Countries I think are a no go since Germany can reinforce a lot easier than the allies. So that only leaves...