Wow. I want to thank you all for your thoughtful and extensive responses. I can see I have ALOT of work to do before i can even begin to consider this Timeline. 
I was thinking of trying to throw a Second(or modified First) R-J War into the mix, and using Austro-Hungarian interests in Tientsin and an opened Caucasus to Austro-Hungarian Trade to create a situation whereby Russia found itself forging economic links with the Austro-Hungarians, with Russia's gratitude for Austro-Hungarian economic(and possibly diplomatic) intervention in the conflict leading to stronger ties, which are capitalized upon for a secret agreement to create spheres of influence in the Ottoman Empire. Convoluted and very unlikely, as i'm sure you'll agree.
I was, however, ignoring the influence of Pan-Slavism. Perhaps i could do something with Montenegro's aggressive expansionism alienating Russia or something. I don't know much about the Balkan Wars or the influence of Slavic nationalism on A-H/Russia, and I can see that is an area I'm going to need to swat up on to make an A-H/Russian Alliance plausible.
1866 seems a little early for a POD, and i'm not so sure about the impact of a War with Germany in the 1870/80s. It would probably lead to the re-establishment of some form of Polish state, if only as a rump protectorate. (Assuming the Germans are victorious, which is a safe assumption imo)
As for a coming World War...if Pan-Slavism/Irredentism is being downplayed/neutered/isolated as a force, then its pretty much up in the air what the casus belli for the Great War would be. An Arab Revolt, perhaps, which could complicate the spheres of influence of the Great Powers (Britain in Egypt, Russia possibly gaining influence even further south than Armenia, depending on the convoluted Ottoman spheres-of-influence agreement proposed above).
Finally, on the subject of an Isolated Germany...again, it depends on the POD and wether Willhelm's mercurial temperament in regards to diplomacy(especially with the British) can be trusted. Stevep, your probably right about the Ottoman's siding with the Anglo-Germans, but that means scrapping them as a "unifying interest" for the Austro-Russian Alliance.
Once again, I thank you all for your help. It seems i have alot left to learn about the intricacies of early-20th century european politics...(thank god i'm not trying to work in an earlier period...I dread to think of the mess we'd make trying to make an 1820s Austro-Russian Alliance....:/)
I was thinking of trying to throw a Second(or modified First) R-J War into the mix, and using Austro-Hungarian interests in Tientsin and an opened Caucasus to Austro-Hungarian Trade to create a situation whereby Russia found itself forging economic links with the Austro-Hungarians, with Russia's gratitude for Austro-Hungarian economic(and possibly diplomatic) intervention in the conflict leading to stronger ties, which are capitalized upon for a secret agreement to create spheres of influence in the Ottoman Empire. Convoluted and very unlikely, as i'm sure you'll agree.
I was, however, ignoring the influence of Pan-Slavism. Perhaps i could do something with Montenegro's aggressive expansionism alienating Russia or something. I don't know much about the Balkan Wars or the influence of Slavic nationalism on A-H/Russia, and I can see that is an area I'm going to need to swat up on to make an A-H/Russian Alliance plausible.
1866 seems a little early for a POD, and i'm not so sure about the impact of a War with Germany in the 1870/80s. It would probably lead to the re-establishment of some form of Polish state, if only as a rump protectorate. (Assuming the Germans are victorious, which is a safe assumption imo)
As for a coming World War...if Pan-Slavism/Irredentism is being downplayed/neutered/isolated as a force, then its pretty much up in the air what the casus belli for the Great War would be. An Arab Revolt, perhaps, which could complicate the spheres of influence of the Great Powers (Britain in Egypt, Russia possibly gaining influence even further south than Armenia, depending on the convoluted Ottoman spheres-of-influence agreement proposed above).
Finally, on the subject of an Isolated Germany...again, it depends on the POD and wether Willhelm's mercurial temperament in regards to diplomacy(especially with the British) can be trusted. Stevep, your probably right about the Ottoman's siding with the Anglo-Germans, but that means scrapping them as a "unifying interest" for the Austro-Russian Alliance.
Once again, I thank you all for your help. It seems i have alot left to learn about the intricacies of early-20th century european politics...(thank god i'm not trying to work in an earlier period...I dread to think of the mess we'd make trying to make an 1820s Austro-Russian Alliance....:/)