One possible way for China to get
back South Tibet is to covertly support insurgency in North East India:
Insurgency in Northeast India - Wikipedia, the free encyclopedia
India is always nervous about North East India, because the local population there want independence. Because of this nervousness, India wants to have an India friendly govt. in Bangladesh, hence a very heavy handed interference and infiltration in internal politics. India used to support some rebel insurgents in Burma, but it changed its policy in 1990's and became close to Burmese junta to flush out Indian insurgents from Burmese sanctuary. With a change of govt. in 2009 in Bangladesh, some long time settled ULFA (Assamese rebel group) leaders were handed over by our India friendly govt. to India. But by end of 2013, we are hoping that this party Awamy League will be out of power and BNP will be in, which might open some window of opportunity.
In my opinion, China is neglecting this NE-Burma theater.