Some suggestions:
1) Austria-Hungary, except the only parts left are Bukovina and Slovenia, who both refuse to give up the good fight.
2) Mexico-Hungary. The Empire of Mexico somehow prospers, but the Habsburg Empire collapses and the Austrian line goes extinct in the process. For some reason, all the other options look so terrible, the parliament restores the monarchy, which passes down to the Emperor of Mexico.
3) Portugal-England. For whatever reason, this becomes a personal union. However, both mainland Portugal and England are lost, making the Dual Monarchy active instead only in the New England, Southern Brazil, Angola, and the Azore Islands (the capital of the English monarchy)
1) Austria-Hungary, except the only parts left are Bukovina and Slovenia, who both refuse to give up the good fight.
2) Mexico-Hungary. The Empire of Mexico somehow prospers, but the Habsburg Empire collapses and the Austrian line goes extinct in the process. For some reason, all the other options look so terrible, the parliament restores the monarchy, which passes down to the Emperor of Mexico.
3) Portugal-England. For whatever reason, this becomes a personal union. However, both mainland Portugal and England are lost, making the Dual Monarchy active instead only in the New England, Southern Brazil, Angola, and the Azore Islands (the capital of the English monarchy)