If we assume, for fun, a massive clear out of potentially under utilized players, and add some signings, here is what I've come up with.
For both formations I brought back Ryan McAidoo and Divine Mukasa for depth in attacking areas because im assuming we sell alot of players and focus on higher quality replacements.
I think the 4321 from last season with fullbacks wide and rotating with wingers could be used under Maresca.
It probably means we have too many CBs, but Wharton is probably not needed tbh as Reis or Anderson could fill as a Rodri backup. Read is a good shout for attacking fullbacks rotation for Nunes.
Then the more likely 4231 into a 3241 with inverted LB is the more likely Maresca formation (but he could rotate systems). This setup actually needs less signings and doesn't require Read as now Reis goes to CB with Guehi as the RB rotation in a back 3. And now Wharton definitely isnt needed (all assuming Rodri stays), meaning this system is likely cheaper.
I think these setups with these players has higher quality but enough depth, and a chance for younger players (McAidoo, Mukasa, Reis) to get some minutes.