AH Challenge & WI: Greater Tibet

[Iori]

Right, so here's the challenge, have British Tibet retain its borders (as seen in the below map) and have it survive into the present day.

Now, as for the What-If, well what would happen with a huge Tibet surviving, would Xinjiang (now connected to China by a relatively thin area of land) remain Chinese or go independent, will China fragment or Unify quickly, basically what will the consequences be?



NOTE:
The Tibet border is overlayed onto the OTL modern world to show where it is, it's not meant to show a lack of butterflies.