[Gothmog]

What are others thoughts on this?

That you're task is impossible No, not really impossible, but as Esty pointed out; an ordinary approach is not recommendable when it comes to the Silmarillion. One option is to choose one of the many stories (Beren/Luthien or Turin perhaps?). An other option is to choose one theme and follow it through the different stories.

For example: the influence of Men during the War of the Jewels. One could follow the great heroes of mankind and specialize on their doings and deeds. That would narrow down the number of potential main characters and one could concentrate on the ones with most impact on history (Hurin/Turin, Tuor, Eärendil etc). Other themes are for example the Wood Elves, the Dwarfs or some other race/group that isn't described as detailed as the Noldo, where a single character is impossible to choose.

If you want to make it easy for yourself, choose someone like Turin with his own tale and comment his life. But my vote is still on one of many stories or one theme through all the stories. Good luck with your writing!