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
Having been living and working in Thailand isn't an issue but cancel your work permit and extension before you leave Thailand. Have you maintained income from your UK company while in Thailand or is this a new company? A new company doesn't rule out a Workation DTV but without history you are going to have to explain how you will get income, if you have any contracts that would definitely help
If your licence has been expired for longer than 12 months I believe you have to start over again so you will either have to take all the tests or convert from your home license and IDP. So you will only get a 2 year licence