If you bring 120k baht or more of assessable income into Thailand in a year you are a tax resident you have to file a tax return. It doesn't matter how you bring the income in, bank transfers to either your own or a friends account (for your benefit), withdrawing from an ATM, even travelling into Thailand with cash in your pocket
Anonymous participant perhaps that's your route then. You can show the UK company has income, you can show that income found its way to you. If you can show the UK company was registered with the authorities and paid tax even better
given it's now over 3 years since thailand reopened after covid it's probably a safe bet but I take your point, although I've never done the practical or theory tests in fact nothing but the reaction tests