I admit I i'm quite interested in seeing how China develops, a resurgent empire is something that radically alters the balance of power in Asia, I guess the Qing faction or at or least tool is dealt with, if the actually royal family no longer held hostage, are probably going to taken along with the emperor to prevent this from happening again.
I imagine the British must be freaking out given their annexation of Tibetan land was not that long ago, well I guess they can always sell more weapons to Japan for more influence and to help hinder any Chinese restoration.
I'm going to be honest I'm not entirely sure about the Caucasus's, sure a Poland satellite state in the Russian empires will lead to many wanting the same rights, the Georgians and Russians wanting to join the Ottomans though? One way I can sort of see that happen is ironically the Russian empire is planning on reforming and changing it's policy's in the region, planning on giving them more say in their land and local power and customs.
The thing is at this time the Russian Caucasus's are over a hundred groups and nations, most of whom have maps and claims on each other and have committed crimes against each other, this means rather than say the Russians favoring the Christian Armenians and Georgians, who were involved in a lot crimes against the others either ethnic cleansing or taking the best spots for themselves, well suddenly a slightly progressive and reformists but ultimately conservative Ottoman empire that accepts the status quo of their people once they join is far better than losing their privileged spots and being forced into losing power to the others like the Azeris or Georgians the Ossetians.
So the plan to ethnically cleanse as much as they can before the Ottomans arrive and kind of backed into a corner of supporting them against Russian Muslim subjects would be something I can see ironically happen.
Though I suspect the Azeri's would rather rejoin Iran at the time given their ties and shared faith and culture, as this is before the Atheism of the USSR and the Armenians are being backed by the Ottomans.
Finally, to my shame I kind of keep forgetting Portugal exists despite it being a colonial power and it being led by a king is a unexpected change.