New Reality Seeds

[Astromancer]

Try this idea, Franz Joseph trips down the stairs in May of 1914. He spends the summer slowly withering away. The Arch-Duke never goes to the parade. The Russians fearful of Austria getting a rational pro-British leader decide to explain to the Brits that they are terrified of the Turks getting Dreadnoughs (the fear of the Turks getting a better Black Sea fleet push the Russians to mobilize in the Summer of 1914). The Brits cancel the sales of the Dreadnoughts to the Turks by damaging both ships and blaming the Germans. The Germans make a case to the Ottomans and the whole thing fizzles, but not Russian greed for territorial expanion. The war comes later....

From there it's just a matter of what tech level you want to put together with La Belle Epoch social cultural norms. Myself I'd wait the war until the 1950s and mix TL7+1 and TL7+2 goodies in a fight to control the Moon! But go with your own tastes for a delayed WWI.