Only just got back to PS5, is there some type of trick to do ?
You have to create a Turkish PSN account, subscribe to the Extra tier with a non-UK recognised payment (otherwise they simply won't let you make the purchase) and keep that account in the background as it were on your PS5. Then you keep subscribing to the basic Essential tier on your UK account and play on that account whilst still being able to get the benefits of the Extra tier from the Turkish account.
Subscribing to UK Essential + Turkish Extra is cheaper than simply upgrading your UK from Essential to Extra.