I wouldn't discount Colombia that fast. I regret not making it to there on mine, as I looked forward to it.
Also, what is the plan for Africa?
Depending on what you've looked into, Vietnam and China will be the most difficult and/or impossible out of the countries listed. Vietnam as a size issue (haven't we all) and China simply doesn't allow 'aliens' dotting their countryside on their own transport. There certainly are ways around that last one. But I reckon from my old homework that Vietnam won't be the trouble.
I'd start by looking at shipping on that route. Usually show stoppers. Than visa arrangements, and than the route in more detail.
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