You don't need to spend 3 days in a neighboring country I've done numerous border runs by absolute quickest one was 2 minutes. Laos usually takes a little bit longer but I have been out for less than an hour never an issue
You are incorrect. If you have a Thai wife you should get a non o Visa. The non o Visa I have is a multiple entry I can come and go every single day or even three four times a day and they grant me entry for up to 90 days every time I enter. I got my Non o Visa at the Thai consulate in Savannahkat Lao.
With all your documents in order it normally takes 24 hours or less to get this Visa. I have been on this Visa for well over a decade with no issues of me coming and going.