Flight tickets hotels etc and maybe in 60+ days this route will be closed or requirements might be higher with papers you might have to get certified or from canada... If you are that short of cash for that risk, you will see that Thailand isn't that cheap anymore if the new tax laws they imposed and health insurance costs etc. IMHO
I meant not the driving on the other but the wheel on the wrong side reducing visibility. It's ok when the traffic is normal but in Cambodia (or Thailand), I wouldn't like but it seems that you drive a motorbike so ofc no issue.
Malaysia: you can buy it at the bordel - only third party. No idea for Cambodia. Wouldn't it be tough with the driving on the other side given the crazy traffic on Cambodia?