Designing and manufacturing a complex machine such as a new turbofan engine is a very complex problem and it cannot be solved by throwing money at it. Earlier in this thread I described in detail what is called Product Development & Lifecycle Management (PDLM) under the auspices of Iterative Prototyping. So, I do not want to bore everyone by repeating the same information.
Here is what I suggested years ago but no one listened to me
a. LAC's aerospace design should have been compatible with AL31FN instead of GEF404
b. HAL/DRDO should have entered in contract with Lyulka for ToT of AL31FN
c. HAL/DRDO should have continued development of indigenous turbofan engines based on AL31FN foundation
d. HAL should have continued manufacturing LCA with Lyulka supplied engines until indigenous engines were ready
e. Step c and d above could been done in parallel
China did exactly what I described above. They are now ready to replace AL31FN with their indigenous WS10. As you guessed it, WS10 is based on AL31FN.