Of the changes you suggested, I really only think finding true wingers actually requires replacing current squad members.
Getting another 10 is currently looking like a drop-in replacement (Herrera already gone, Medina arguably eligible for that role).
3ATB - I'm not at all sure we'd go in this way. It will be interesting if we face more 2-striker systems going forward, because Bielsa-inspired coaches like to set up their backlines so that you have 1 CB for every forward + 1. In any case, we are laden with CB and CB-eligible players, so this is more of a tactical change than a roster change.
Inverted fullbacks / wingbacks - this is a tactical change rather than a roster change.
One of the ironies of this particular mini-thread is that we were all about wanting more tactical flexibility when Paddy was trying to play-our-way-out-of-the-back into predictable oblivion against high pressing teams, and failing in the playoffs. Now that we are trying to introduce tactical flexibility, we're complaining it's an overhaul of philosophy and players.