The international is connected to your USA motorbike license right? I've got an international license on my USA car license and I'm legitimately able to drive here. In Pattaya.
My husband got his car and motorbike license easily on his own. He posted about his experience...if you still want to do that. It's only valid for 2 years and then needs to be renewed.
Since you're in Pattaya join this group if you care to read his detailed post:
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