HAVE A UNDER 20 JUNIOR TEAM OF 13 PLAYERS
there could even be a league for them too....? Even a cup...
These players then get trained and when they reach 18 yrs old you have the option to promote to reserves or sell them.
What age should they start? 14/15 but your scout could find a range from 14-19
Maybe only available once you've built a junior team training area and pitch?
This is an interesting idea

Too many changes to do to the current system to implement your ideas
who knows what tomorrow holds for us

let's see that again in the future