Where in Africa can I sell an XT600?
 

I have never motorcycled outside Australia (my home) so I need a bit of help here.
Later this year I am planning the following trip: Fly one way to London, buy an XT600 and ride through France, Switzerland, Italy, boat to Tunisia, Tunisia, Algeria, Niger, Chad, Sudan and Ethiopia. If I can I will ride to UAE via Yemen and Oman (has anyone done this recently?).
I will try to avoid getting a carnet, which means that I may have to cut out some of these countries. The reason being is that I want to sell the motorbike somewhere along the way without having to go back to England.
Which of the above countries require a carnet? Is there a definitive list somewhere on the Internet?
I have read stories on the net about people buying cars in Germany and selling them on the border of Mauritania in "no man's land". I don't want to do this and would prefer to do it all legally. Which countries can I do this in?
Finally, are there different rules for Australians than Europeans?