Can I start by saying we missed the best option in Mamardashvili and the other options are fairly limited. However, the little I have seen of Marco Carnessechi has been very good. I would wait for him to have a good season this season and then go in for him.
Mamar's transfer to Liverpool ironically gives us another opening. I can't see Alisson settling for a bench place, so if they plan on making Mamar 1st choice, I'd try and nick Alisson.
If not, Kelleher on loan for a season might be the best option until a new prospect pops up.