And multiple as well... If you don't have a re-entry permit & leave Thailand, you won't be able to enter on the old Non-B visa and have to start all over again...
You can get a Non-O based on marriage from either Savannakhet or Ho Chi Minh consulates without showing money in the bank. Unfortunately you can't go into either country at present.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.