Agreed, gone way off topic.
Correct richard, this IS one way to prove you are a Samui resident, that is how I got my card, but reading the OP it would appear he will not have a yellow book and pink card. Just for interest, my wife also got her card on production of our marriage certificate even though her ID card shows she is resident elsewhere. (We do live together on Samui) 😉.
Can Samui, maybe it is worth buying a blank lease document (10 baht at a stationery shop) and asking your wife to fill it in and showing you have a long term (2 or 3 or more years) tenancy at the address you are living at and take it to the airport and see what they say. Worth a try.
Agreed, this thread has gone way off topic.