Try this one...
This reworks an old idea to a different goal. As with
Azoth-8 there is an Alchemical Revolution in the 1930s. However, Parson's insights were witnessed and understood by a British scientist (like
Parsons also a black magician) who was a follower of
Oswald Mosley who took Parson's insights to
Himmler.
So the local year is 1942, America has flying saucers, huge things with a radius of 1,000 feet, but it is known that Germany is building their own. Meanwhile, Stalin will do anything to gain the secrets of the American Flying Saucers.
Basically, this blends some Sci-Fi into WWII. You can go in a
Hard Vacuum direction. New York would be bombed first, Hitler had a deep hatred/jealousy of New York City. An espionage campaign with mystic add-ins is also a possibility.