the good thing is - some (!) Thai police will accept your drivers license if it is in English. The sad thing is, if you have an accident, your insurance and the insurance of the vehicle will refuse to pay for any damages and personal injury, because you didn't have an IDP. Then you will need a very good lawyer to get you out of Kalamazoo . errh, Calamities
visit a tour agency office on Ko Samui, they will arrange a "border run" for you to the Malaysian border. Costs you should expect around 4500.- THB. It's a full day trip
the Kor Ror 22 is the up-to-date marriage registry printout, it supersedes Kor Ror 3 and Kor Ror 2 as a proof that the marriage still exists. Maybe your Amphoe does it differently - This is Thailand were some things never are logical