You are very wellcome.
To be honest,I've been in your setuation a few times, and I know haw bad
one can feel.
Well done for getting hold of that boat. It seems like a good idea.
I was lloking around a bit, and could not find anything better over the internet. Cameroon is a bit of dead end, transport wise, so a ship to the cape may be the way to go.
Try and be firm with the shippeng agent, and better, have a wrrietn agrement on what he oblied to proved, including "handlig fee" "port Fee" "loading fee" and all the other "Fee" they are so found of!
Another option, if they get on you nerves too much- Gabon is a bit better developed, and there's much more bussnes in Libreville then Yaonde. So
another way in to carry the bike to Gabon, and have it shipped from there.
Japan is incredible, and yes, the Cherrys are in full blossom. But to be honest, I miss Africa.
Good luck, and safe travels,
Adam, in Kyoto, Japan