Thanks for all the help.
To summarize the thread:
I acknowledge that most replies were meant to be helpful.
The replies basically fell into these categories:
1. Suggestions that my wife or I change visas.
2. I shouldn't ask at Thai Visa Advice. I should ask at Immigration.
3. A tangential debate as to whether fixed accounts are acceptable. Maybe some aren't. My wife's has always been accepted. That wasn't the question.
Thanks to
@Ivan ***********
who not only understood what and why I was asking, but his suggestion is even better than what I was trying to accomplish.
Because everyone has been so helpful, I'd like to pay that back with two suggestions:
1. Everyone using the 800k method should have their funds in a time deposit. if you don't you're leaving over 10,000 baht on the table. that more than pays for your next extension. Or a lot of beer. You're welcome.
2. If you plan your travel right, you should think about changing your visas. In 15 years I've never been to Immigration except for Certificates of Residency. No extensions, no 90 day reports, no TM 30's, no need for a Thai bank account.