WS-20 took solid 10 years(2013-2023) from first flight to serial production.. but this was the first ever high bypass Turbofan Engine project and back then China's had backward gas turbine industry.. WS-10/WS-20 transformed China's gas turbine industry and build a solid foundation.
at Zhuhai air show in 2022, AECC showcase the civilian version of WS-20 called AEP-1300 with composite carbon wide chord fan blades.
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WS-20 family is now in full scale production.. what i have heard from my source, they are planning to produce WS-20 engine in large numbers due to huge demand.
so if PLAAF really need P-8 Poseidon then XAC can very well purse the project with new airframe and obviously Engines are WS-20/AEP-1300. you don't even need C919/CJ-1000.