Welcome to HU.
This sounds like a great trip but as mentioned above has lots of barriers to be overcome. I would consider flying out and 'backpacking' around. This will be cheaper and not have as much bureaucracy.
You do not want to be rushing to get to your camp by a particular date, so whatever you plan, build in lots and lots of additional time so you can experience the places you are travelling through. You need to allow for one or two rest days a week and make allowances for technical problems and illness: 3-10 days per incident!
Having said that there are lots of nice motorbike trips that you can put together out of the countries that you listed.
My view is that if you only have a limited amount of time then you are better off spending it in the far-away countries (fly/drive). The near countries can be visited in shorter windows on motorcycle.
Check out the various travellers' reports for Plan B.
Enjoy
Niall
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