If Lodi is the target to be a reliable Pirlo sub, than I guess why not give Marrone a real and decent shot at that position??? The kid is talented, he needs to play.
Conte used him as a backup SW not because he isn't good enough to be a CM, but because of the lack of backup CBs in the team.
Just get a decent backup CB to replace Bonucci and play Marrone in Pirlo's place.
Vidal/Pogba on the right, Marchisio/Giac on the left side of the midifield.
Buffon (Storari)
Chiellini (Peluso) - Bonucci (new CB signing) - Barzagli (Caceres)
New LB (Asamoah/Peluso) - Litch (Padoin/Isla)
Marchisio (Giac/Asamoah) - Pirlo (Marrone) - Vidal (Pogba)
Jovetic (Vucinic) - Higuain (Llorente)