You can toss in Tibet throwing itself at the Raj on top of this while Russia grabs East Turkestan.
Still, the historic/cultural/demographic core of China remains. You could get the Taiping rebellion getting even less fun and sucking in opportunists followed by actual government trying to get them under control.
Internal problems within Japan might limit their ability to colonize China, allowing Europeans to take their OTL concessions. The British, French or Germans could take Taiwan, for instance.