All is long stay visas are 1900 baht you’re required to have money in the bank differing depending on the reason to stay … retirement…. Marriage …priesthood educational. There are agencies that can provide with the correct stamps probably 20/
No it isn’t worth the hassle. There are heaps of secondhand bike dealers in Thailand. It easy to buy register and insure… and apply for a driving license. It’s worthwhile doing all those things as you will be stopped for sure. That can get expensive!.