How much could the Ottomans gain if the CPs win the First World War. Victory can be as big as possible.
We appear to be overlooking vassals, and autonomous/independent rulers re-affirming allegiance to the Caliphate - this is certanly possible in Egypt, and in Tunis, where you remove the British and French protectorates and replace it once more with Ottoman overlordship. The Senussi would have welcomed the Ottomans back to Libya, with themselves as under-kings (they did after all become kings after WW2).
The Ottomans would be looking for the same thing in Arabia, backing the anti-Saudis, and probably looking to regain overlordship of Kuwait.
IIRC Asir (between Hejaz and Yemen) had also gone wandering a bit, and reaffirming its ruler's subjection to the Ottomans would be important
As for the Crimea, the Ottomans are never going to directly annex it, but if they back an independent Tatar state, then this will probably also acknowledge Ottoman overlordship
Best Regards
Grey Wolf
I dont think Germany directly annexing the Crimea is any remotely likely, so why not play divide and conquer and have an own Crimean vasall besides the Ukrainian vasall? Of course, it would pretty much be a German vasall, in that case. Then again, I dont think the Crimea is high on the list of Ottoman priorities.The Germans had designs on Crimea, they wouldn't have allowed the Ottomans to take it, or even set up a Tatar state.
I think Algeria, or even Tunisia is stretching too far. Libya seems plausible, since it has only been a few years and there is still a resistance raging in Libya.