I guess JF-17 might not fitted the bill of Myanmar AF.
Saudi and Nigeria are the 2 possible candidate.
https://inf.news/en/military/96a71c7fb22591b68c4e35a751898173.html
How do you know WS-18 is low by pass? It looks like DKP30 engine, doesnt mean it performs like it. With new metallurgy, WS-18 spec is definitely better than old Russian engine. Plus, PLAAF seems very satisfy for WS-18 that they continue using this engine with very slow induction phase of WS-20.
https://www.irrawaddy.com/news/burma/myanmar-regime-buys-ftc-2000g-fighter-jets-from-china.html
The Myanmar Air Force has ordered several FTC-2000G midrange fighter jets from China, a major arms supplier to the Southeast Asian nation......
With Russia weapon effective blockout by western nation for export except India. Algeria now can only purchase Chinese weapon if they want to go non westernise weapons.
Low flying helo is even more dangerous in war situation. You are easily in the range of small arms like 0.5 cannon or heavy machine gun. Flying higher means those small arm are ineffective to take out those helo.