Let's look at the "Germany gets Bohemia" - You will have to somehow butterfly Bismarck and the Crown prince - maybe a wound sustained in the Prussian - Austrian war could do that. The King, and the Generals do push through, conquer Bohemia and on to Vienna.
Then we'll have to look further to weakened A-H influence (without Bohemia) , maybe an Independent Hungary or very autonomous at least - again the A-H compromise of 1867 was mostly the result of the lost war.
A-H or what's left of it will not be a major, if any party to the Berlin Conference and will not gain Bosnia, butterflying further away the Archduke's assassination in 1914 in Sarajevo.
Lastly, without manpower and the arms factories in Bohemia (Prague the 3rd largest city of A-H ITL, and the Skoda works being one of the largest arms industry and metalworks in A-H) you will get basically neglible Austria - Hungary or even two of them independent , with neglible influence at the Europe's politics at all.
There goes then the question, why would France and Britain even seek any alliance with the Austria - Hungary.
I'd suggest maybe a different stances at the Berlin congress, with Bismarck out of the equation, seeing Germany backing the Russia instead A-H and causing the A-H to join the Entete powers instead.