carnets, insurance, and ditching the bike

[beatfeet]

I'm in a bit of a unique situation for several reasons, but more or less here is the deal. I'm an American citizen living in Japan with a Japanese work visa and a motorcycle registered in Japan. I will be leaving in a month possibly headed across Russia/Mongolia/Europe, and at the moment I have no carnet (it doesn't seem to be necessary for these areas) and no international insurance for the bike. My main question is this: how difficult would it be to buy insurance for Europe at the border (or via internet in Russia), and is it possible for me to get a carnet after I leave Japan (if I decide to go to Africa)? I don't want to deal with obtaining a carnet right now, because I may not even need it. Also, my work visa will be expired, so I will be an American citizen with a Japanese registration. Does anyone have a guess as to how that affects getting a carnet or insurance? More importantly, what happens if I "wreck" my bike or it is "broken beyond repair" while on the road (it's a bit old)? Do I still have to pay an import duty if the bike is garbage? Basically, is there anyway to ditch the bike in transit without paying tons of money in fees (the bike is valued at $1,500US)? I hope this all makes sense.
Thanks a lot.
Take it easy,
ryan