Big bikes - foreign registrated - are as good as impossible to get into Vietnam.
Malaysia is a carnet country - if I have understood it right - so you will need that for Malaysia.
Visa on arrival ok in Laos, Cambodia, Malaysia and Thailand (but for Thailand maybe only 15 days on land border crossings depending on your nationality)
Visa for Vietnam needs to be arranged before entering.
Maybe a better option would be to rent a bike in each country?
A few rental companies in Thailand would allow you to take a rental bike into Laos -for a higher fee of course.
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In the end everything will be fine. If its not fine its not the end....
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