If I was called in for the 100k USD I remitted on Jan 3, 2024 I'd show ,y passport with a valid LTR visa (possibly I'd have RD743 in Thai with me), and/or give them statements showing that the remitted funds were on my account on Dec 31, 2023.
So how long would that take? What could happen, a demand to file a return and a 2000 Baht fine? Big deal, I'll wait until next year to see how this unfolds.