I agree, traffic is quite bad in many parts of Asia. Would be very valuable to have at least SOME riding experience under your belt, because thatīll be jumping in the very deep end. I do know people, who have done it, completely unexperienced, and survived, but they were very lucky. Thatīs something to think about, as well as the fact the whole insurance thing is totally different from back home (read: pay all damages to anyone out of your wallet). Not meaning to scare you, though.
How about maybe doing a riding trip in Thailand first? Youīll get some idea of the traffic, but especially if you go north, you can practice in less congested areas. Besides, the roads around Chiang Mai are beautiful!