It was the way followed by Kaveri program. It is among the hardest job so far, and see the chinese exemple : it takes 30 years for them just to be able to copy and paste russian engines.
While high performance turbofan engine technology is a niche technology and uses cutting edge materials science knowledge, let's not turn it into some sort of Star Wars technology.
It was created by a human brain, not some alien Martian technology. If the Americans, Russians, French and the British could do it, so can the Indians(and probably also the Chinese).
I believe its about recruiting the right people with the desired skill sets and effective project management. As the Indian high school teaching framework makes a move from rewarding rote/memory learning to rewarding independent thinking and grasp of basic science concepts (practical applications of science) it will provide the ladder to make university education(graduate and postgraduate) more effective.
There needs to be a transformation in the Graduate and Postgraduate educational framework. The professionals coming out of these institutions should be world class and employable.
It is an indisputable fact that the American Higher Education system has been a primary factor driving US innovation.
India needs to develop an similar high performance educational system(not needed to mimic the US system but something suitable for Indian conditions).
We will see more indigenous innovation and patents happening in India.
And to remind the French. Although the French military industrial complex is a high output system, it did receive a lot of American technical assistance immediately after the Second World War. So for the French to become too snooty is perhaps not justified. India has the potential to become another pole in a future multi polar world. Helping India in jet engine technology is actually a good strategy for France. It will benefit both countries in the long run. I am sure that the French will like to become more independent of the US.
It will certainly not be charity. India has the ability to pay appropriately for the technology.