Sounds like an original idea. Curious to see what you'll find. Especially how soon some player will get their second pops. Probably good to focus a bit more after a while but I still fondly remember my starting days when I trained 5 players in 2 position training and since my team was horrible this quickly improved my whole team.
Just don't do this to the high potential players since you won't take advantage of it and might just as well sell them and buy all star or star potential for cheap.
Crunchy! If you eat fast enough