Keeping Dean Henderson is essential at this point, given the uncertainty surrounding DDG. By all accounts, he’s potentially top class and England’s best technical young goalkeeper.
If De Gea wants to go home, good luck to him; at the end of the day he’s earned it - 3 years after the Madrid move fell through initially, he’s been a superb professional and kept quiet since.
Romero is a valid replacement, IMO. Has never let the team down and know the club too - there’s no point in importing someone who’s not used to the aerial bombardment of the Premier League....and Donnarumma is the biggest hype job in football since Freddie Adu.