Amazingly, you've managed to highlight the one switch that we don't need to buy for. Konsa is a ready made RB switch for Cash and suits the Emery system brilliantly, its just we need him for CB at the moment with Carlos on his way back.
I would be delighted to start next season with a back 4 of Moreno, Mings, Carlos, Konsa.
As others have mentioned, your bang wrong about Konsa and being "done". He's barely been done at all this season, if at all.