The Football League would never agree to such a move.
The lower tiers of English football are stronger than any other country, we have professional teams in the 5th tier getting gates of nearly 6k! That would be unheard of anywhere else in the world. The Football League wouldn't welcome large numbers of B teams of Premier League clubs taking up space in the league system, plus it would actually be hard for any B side to compete with some of the large Football League sides in the same way they do in Spain for example.