I had an idea of Jurchen (or other Tungusic) tribes migrating instead of into China but westward towards Europe, maybe partly along the Silk Road, and settling in Carpathia or Pannonia. Eventually, they would assimilate and mix with the other peoples in the area, leaving a state (or several states) populated by people of European appearance but speaking Jurchen / Manchu / another Tungusic language. Is any of this plausible?