As far as China and Xizang are concerned, the solution is very simple. The 15th Dalai Lama will be selected from the golden urn. No one else matters.
Let India and the US appoint their own Dalai Lama. Let them bicker over chooses the Dalai Lama and who holds the leash. Let them market their Dalai Lama(s), because it ultimately doesn't matter to the people of Xizang. They already have their true Dalai Lama.
Ultimately the true Dalai Lama in Xizang will be followed by millions of real Tibetans. While the fake ones out there would only be followed by the much smaller Tibetan diaspora, and the hordes of gullible foreigners.