big clamp down now on opening up bank accounts without the correct visa. Long gone are the days where they'd accept your cash. This persons best option is to apply for the correct visa in his own country before arriving in Thailand. Then the process is pretty straightforward
you can also get a "dependency " visa which all you have to do is get your marriage certificate verified by your embassy, then translated into Thai and verified by the ministry of foreign affairs. This way only 1 of you (the visa holder) can attach a dependent and only have to deposit 800K or show the 65K (for a full 12 months).
This is what myself and my wife do successfully for the past 6 years.
I don't know if this is different for different countries (we are British).
it might actually be an idea to go to your bank and show your current visa. Their records will show your on a ED visa so you could actuallybe at risk of your bank closing your account.