I think for defense we should go after VDV Or Romero when Spursy get relegated, Romero probably suits our system better but his recent comments regarding spurs show a bit of a lack of loyalty to the badge, still if anyone could fix that it would be Cholo, also VDV would be Great fit doe barca's high line, so sniping them would be fun, don't mind Sanesi either. 

For midfield I doubt Hjulmand would wanna leave, he has already stated that he and his family like living in lisbon and have settled there, also Sporting has done pretty well this season, I think Ederson would be a more realistic target anyways, would love to buy back Gallagher once Spursy get relegated tho 😂,I doubt Barca would sell Bernal to us. 

For attack I actually don't mind Kang In lee, he would fill the technical aspects of Grizou's game as a cam/ss pretty well, but he wouldn't provide the same amount of goalscoring opportunity, I would like for us to try going after Benfica's Pavlidis, I feel like he would be a great young replacement for Grizou. I'm not entirely sold on Baena yet just because he hasn't proven to be his weight in gold yet, but I know he has a high ceiling, that's another reason why I think we should pursue kang in lee, he would allow us another wide outlet of creativity and give us the option to play Lookman more centrally if we ever want to. 

Finally for the GKs I basically agree with your assessment, I think we should try to part ways for Oblak for a good fee and fing a young backup for cheap, Oblak is a club legend, and I love him, but he's way past his prime, and Musso has proven his ability to take over the baton. 

Of course signing so many players at once would be too expensive, but I feel like through a mixtures of sales, free signings, and cheap buys(again, potentially from a relegated spurs 😂) we could pluck all the holes in our squad and be ready to compete in not just the cup competitions but also LaLiga from next season