I had successful applications after travelling, but sent letter making it clear no travel to Thailand and returned to country of application. They can come back asking for proof of location - they did in my case, hence I went back.
It's not true that you can't generally travel during visa applications, many countries allow this. It's not clear though whether it's generally permissable for Thailand. Also different embassies may treat differently. But I was successful after making it clear that I had.
Thank you! That's very kind of you to offer. I've still got to work out what we'll do for my partner. He's retired, on pension, but not yet 50. Once we get all that worked out, we'll decide how to proceed. All in good humour re everything else. I hope no offense. Best wishes! 😁