Sounds brilliant , not being too negative but you won't be able to fly the bikes out of Vladivostok or anywhere close to.
The best way in my humble opinion is ferry to Korea then truck the bike to a major airport to fly out to the USA .
I think you can get to Vladivostok quicker than two weeks but as already said what would you see and what would you experiance . I covered the trans siberian road last year and it's looooonnng and boring , it's the people you meet that make it an adventure .
I would do it again but leave more time on my visa to explore the place, the Siberians are so friendly .
With a trip like this any little delay could put you into some serious weather and problems, and we all know it won't go like clockwork .
Anyhow keep posting like to see how your trip goes
Take care have fun and smile Mark
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