Well, everyone is trying to sell because its a popular trip and because everybody says that "it's not a problem to sell it there" when you prepare for your trip. Of course the reality gets more and more complicated with time. So I guess the right advice would be "It's complicated, and should be arranged ahead of time". But it's all too late for me now.
Also, there is no option of exporting it for me, because my country also accepts only new bikes :)
Thanks for the input, and could you please elaborate on what might be the implication of flying out without solving the customs issue? Banning, seriously? What did you hear about Paraguay, wouldn't it be simpler there? (it looks like a 3 days ride..)