You're aiming for a pretty narrow band there - players signed from League clubs where they are first team regulars, in order to become part of our development squad. It's not a hugely common scenario, for any club.
Not English Leagues, but the closest to that would be Ben Hall, who was playing...
All of that would be perfectly fine, if not for the fact that the club have been so focused on signing this lad that they've now FORGOTTEN that we needed a first choice striker, and have now condemned us to inevitable relegation.