actually If you stay more than 30 days then you can apply for local license against this international license. What you need is address Prof from immigration, passport copy 2 photo, this license copy, application form (collect it from there) and maybe 210 or 310 bath fee. Take the que before 8:00 am at Phuket Town road and transport authority.
I got married in 2015 and truly speaking I didn't give any sinsod and my wife or her mother never asked me about it. Just gave her wedding ring and chain Wich was cost around
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bath that time. My honest opinion is that if your fiance pressure you for that then you should think again for further relationship.
You can send through MoneyGram or western union. It's very easy and simple. When you send with in one minute she can draw the money. Just need to send the photo of the sending receipt to her.