Why not take out a ton of loans to support a temporary massive army to go out and wipe the rebels and reclaim the provinces? Might lose a couple times and be forced to retreat, but they can be defeated. Granted it may be too late if the OP has released a lot of territory already.
they spawned in about 95k stacks. the first wave were 3 as i remember, but there were a lot more after some more months, and they didnt lose any manpower. impossible to kill those stacks if you have another million rebels everywhere and its faaaaaaaar away in china and your units cannot finish cause they always get slaughtered by giant peaseant stacks. its just game over. you had to bring a 150k stack there to even win the fights without dieing completly, but then you still have to siege+sell while your whole country is seized by rebels after 2 years. which will just enforce their demands if you dont give it to them cause there is no way to fight endless amount of rebels spawning over and over and over and over again until your confucian great britain with 5 provinces.
gg