There is no harm in trying to get the best options first mate.
It is normal that the club should try everything in it's power to bring Klopp, if he says no then it will at least build bridges for the time when he decides to return.
Some under contract coaches could be attainable though, PSG isn't very happy with Lucho and mutual divorce might be good solution for both, Inzaghi contract ends in a year and Inter might honour his wish to leave.
As for other options, De Zerbi is a coach who will fail in his first big cluyb move. He isn't even the star of the show but the SD of the club. Never mind Brighton will ask for massive compensation from him.
Imanol and Michel are solid options, not sexy names for the fans but more of EV type of hire. Capable of getting the job done but nothing eye catching.
Flick is a 59 years old whose entire career was in 3rd & 4th divisions or assistant. Then was hired in Covid year and had a dream 6 month beating teams led by Setien, Lampard and ligue 1 clubs. Then he had typical Bayern year and then became Germany worst ever manager.
A 1.5 year at professional club level at the age of 59, he is just 2 years younger than Mourinho who is now considered ancient coach. I won't hate the club for hiring him but he isn't what fans are fantasizing about.
Naggelsman has the brain, but his ego is insufferable and is a stubborn sob. If his time with Bayern has humbled him he might be a good choice, otherwise he will come with some of Xavi's package, and then he will be fighting with the media on hourly basis.
Some surprise coaches will be availabe too btw, this always happens
1) Age argument is valid.
But please don't try to underrate Flick's job at Bayern with all that BS about covid, etc.
The football he played was more than sensational and in line with all the Barca prinicples at modern era:
high intensity and pressing, super attacking, suffocating every opponent
2) Time has shown how bad decision was the sacking of Nagelsman by Bayern board.
Even the ones thought back then that the decision made any sense, now turned against them after the next 10 months showed the truth
3) Lucho isn't available, and PSG are happy with him. Kelaifi won't allow any part of PSG organisation to go to barca, unless is trash they won't to dispose.
Besides, it would be 100% wrong appointment by many standards.
PS: nothing wrong in trying to get the best out there, but I am saying realistically they are not coming.
Pep, Klopp, Arteta ain't coming
So people should stop daydreaming