IIRC there were several instances during 1871-1900s where a conflict between Germany and France could have erupted. Assume germany (again) steamrolls France. France maybe develops an unrational "fear" about germany instead of revanchism.
As effect GErmany is left with no real enemy in Europe
Assume Germany goes full colonial - maybe in Asia too - Make a German Japanese alliance - then you might end up with a German-British standoff in Africa (Especially if Germany grabs more land that is OTL a French colony) and German /Russian /British one in Asia.
THE OE would probably be in the German camp - British backed Greece and Russian backed Bulgaria(Serbia?) wanting pieces of the OE...
Germany might probably need a large army in the west to prevent a French attack (which might come - it is even logical, but in this scenario not necessarily at the beginning). IF Britain sends an epeditionary force to Russia it might be the backbone around which russian units can build a good defense.
(assumuing roughly the same capacities of the various countries)
Italy might not be in the war from the beginning, but I don't see an obstacle that it aligns with Britain from the beginning.
A good reason GErmany and Britain are at worse relations is a German Somalia where Britain fears the Suez route is cut off...
The "full colonial" push by Germany really just makes it more vulnerable to the UK in particular. There was a reason Bismark wasn't keen on establishing colonies, Germany was late to the game (being formed so late in the 19th century) and being a land power with strong states (eg. France) on their borders mean Germany also cant just dump the bulk of their defense spending into their navy (unlike the UK, which is largely why Germany lost the Anglo-German dreadnought race despite having more heavy industry than the UK). This means that the security of any of these German colonies will be dependent on the goodwill of other powers, chiefly the UK and the RN. If an ATL Germany gets in a war with the UK without a major land ally for the UK in Western Europe being threatened (eg. France) the UK wont try to land troops and attack the Germans directly (they cant hold a major land front in Europe against Germany alone (at least not without years of building up their army on land by training colonial troops and redirecting them from across the empire, as in OTL where the BEF in 1914 was initially very small compared to the French and German forces in play), at most they can complement a strong land ally (France in WW1). Especially if this ATL Germany is heavily investing in its colonies, the UK is just going to focus on seizing them in a naval war and then using them (and the inevitable RN blockade of Germany) as bargaining chips to force a peace of pro-British terms. Germany then has the choice to lose its colonies permanently and suffer under a British blockade long term or seek peace, but the UK would never be stupid enough to try and fight the German army alone on land. As to the UK backing Russia with an actual army (ala France): it is unlikely, because the logistics of projecting and supplying a force large enough to make a significant difference on that front would be much more challenging than they were in northern France OTL in WW1. Furthermore, Germany beating Russia in a war doesn't challenge British security the way Germany conquering France would (Russia is way to big to be fully conquered and the Germans seizing Russian ports doesn't threaten British naval security the way Germans taking Dutch/French ports would- the Germans cant pose a credible invasion threat to the UK by taking Archangel). Again what you would see here would likely be the UK financially backing the Russians or possibly simply steering clear of the whole issue. If somehow they actually were drawn into the war it would likely be a naval conflict like what I stated above.
Really, France is the linchpin of WW1 for the allies, not the UK or Russia. To get a full World War in Europe, which draws in most or all of the Great Powers you need to get France and Germany to fight each other, a war between Russia and Germany in the Balkins will just remain a regional conflict. Those are simply the geopolitics of the day.
PS: At this time the Anglo-Japanese alliance is in effect, so unless you plan to butterfly this out as well there really is no way to get the Japanese to support Germany against the UK (indeed as in OTL they would probably use war between Germany and the UK as an excuse to grab German colonies in the Pacific). Like Japan, Italy was pretty much just an opportunistic participant in WW1; they jumped in and did a little fighting when they thought they could get some territory for little effort.