The Tocharians were a mostly Buddhist Indo-European speaking group that lived in the Tarim basin until the 9th century or so, when they merged and assimilated with the Uyghurs and eventually were Islamicised with the rest of the Tarim Basin to create the modern Uyghur culture.
So is there any good way to keep the Tocharian language alive? They don't have to be the dominant culture of the Tarim basin, nor maintain their "caucasoid" looks they were noted for. But can they survive at all? One thing that crossed my mind is using religion for that. If the Tarim Basin remains Buddhist or Manichaean, can the Tocharians adopt Islam and become like the Hui? The Tocharian language would be much reduced, but they'd have a distinct identity.
And if not Islam, could Nestorian Christianity be the solution? The Tarim Basin is where Nestorian Christianity entered China, after all, so could a vigorous and skillful saint convert the Tocharians and even after the calamities that befell their civilisation, leave behind a remnant culture maybe akin to the modern Assyrians or Copts? I don't doubt Tocharian would be endangered in this scenario, but does it have a chance with this, or at least to survive as well as Coptic did as a liturgical language with a large amount of writings?
I'm interested, so any other ideas or comments?