Few of my realistic(ish) suggestions. I think "league experience" is a bit over-rated. I'm more interested in managers being good tacticians, preferably with decent backroom experience shadowing top-class managers.
Wilfried Nancy (Columbus Crew) - Got Columbus Crew playing really attractive football. He's known for being the tactician of the MLS, but is really well liked by the players too. Might catch the owners eye, as he's won a few cups in the past few season.
Pep Lijnders (Unattached) - Klopp's former number 2. Didn't work out at Red Bull Salzburg, but he's a smart guy with a clear philosophy. Lot of the best managers started as number 2 to the great managers.
Ian Cathro (Estoril) - Scottish former assistant manager to Rafa Benitez and Nuno Santo. Moved to Portugal to manage Estoril and has impressed. Only 38, so could have a fresh approach.
Rob Edwards (Unattached) - No idea what the hell happened this season, but worked miracles at Luton. Maybe just needs a fresh project.
Kevin Muscat (Shanghai Port) - Been successful managing in Australia, Japan and China. Proper nasty bastard who has relaxed with age, but could still keep a bit of that Wilder fire.