I never have the time for research for a proper TL
But some after- 1900 ones are:
1. Proto-fascist general takes control of France because of the Dreyfuss Affair. Decides not to activate Dual Entente, if Germany also sits out (like the Russo-Japanese War). German military "volunteers" help Austria, but Conrad stills screws up. Russia makes gains, but is pushed back.
Peace at least by 1916 as Franz Joseph dies. Concurently, 1914 Irish uprisings, found to have been armed by Germany, leads evil French general to send German arms to Libya, causing uprisings.
1916/1917, Germany (if SPD I think??? has not reined in the military) is facing a bloody but mad Russia (who could have "won" if France entered or Germany stayed out), angry UK, and Italy wondering where the rebels got those Krupp weapons.... Perfect time for a WW1!!!
2. France remains divided by the Dreyfuss Affair, like late 1930's... what happens when the Germans arrive? "Better Kaiser than Dreyfuss?" (Doesn't have the same ring...
3. Might have to be in ASB since requires Goering to allow carriers, and a Prussian to defect, but Germany has 2 Bismarck/1939H-class and 2 "Lexington" class carriers working up at least by Sep 1939.
Admiral P, worried that this Bavarian corporal will lead to ruin against the West (has no problem with Polish invasion

) decides to defect by March 1940, sure Hitler will fail. Then May starts

.
What do the British do with this new fleet? (I vote claim full of dark Nazi wizardry, but the British will sell to America at a loss really, considdering how
good these ships are; also, thought might have Jews crew the boats. They need some good news, and probably the only skilled workers no one will poach. Just tell Hitler the grease is made from pigs and shell fish).
4. Get those CF (those ugly flight cruisers of the USN 1930's design) built 1930/1931. Would get people thinking about angled decks... but I bet would have to lose a turret or two. When found to be useless, don't scrap! Just give to the USMC. Wonder what they would do with it.
5. Red Wolf- the daring 1930's story of a German middle class officer, who saw how nationaism destroyed his counrty, capitalism his family's wealth, democracy a whole generation... turns to communism. Think Cardinal in the Kremlin. Hey, if he can do hour by hour reports by May, 1941...