My only experience in the Middle East is UAE, where they accept ICAO licences, so no problem with a UK issued one once you have the required experience. Pretty sure it’s the same with most of the other ME states.
No personal experience in SEA , but unless you’re in Europe there is no difference between UK part FCL and EASA licences.They are both ICAO
licences and both acceptable for validations or conversions for all the jobs I’ve seen advertised recently. Good luck.