Honestly, I think if that's the route you want, I would separate it into 2,5 parts... take your own bike and do Europe/Balkans/Turkey/Central Asia and back through Russia (no carnet if you don't go into Iran).
Then fly to North America, buy a bike locally, do the US/Canada.
Then fly to Vietnam, get a bike locally and ride around. Sell it, go to Thailand, do the same. Take an AirAsia flight to Nepal, same thing. See if you can get into Bhutan.
Tibet would be cool on a bike, but if you are desperate to see Western China, well, the public transport there (trains/flights/buses) is quite common and getting in on a tourist visa without a vehicle is simple.
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