is there any way they can move him?
If they are willing to send out an unprotected pick, then perhaps. Right now they are 12th worst. Would that be enough for a team to take on literally the worst contract in the NBA? (though Chandler Parsons seems to be knocking on the door, poor Grizz)
Trading for an expiring contract would open up a max FA slot for them. If they can also dump Lee and Hardaway it would open two max slots. This might actually be a decent strategy, as Porzingis might attract some good free agents. Regardless they need to stop signing mediocre players to long bloated deals.
They might get away with a lesser or protected pick if they take back a not-quite-as-toxic contract from a rebuilding team. They could also include some "sweetener" players in the mix.
Some trade "targets," all of whom are paid less and/or are functional players with at least a bit of upside:
Brandon Knight, Phoenix. 3yrs $42M
Bazemore, ATL , 3yrs $54M
Marvin Willams, Charlotte, 3yrs $42M
Biyombo, Orlando, 3yrs $51M
Mozgov, Brooklyn, 3yrs $48M
Omer Asik, Pelicans 3yrs $34M (Pels aren't rebuilding but might want supplementary picks/players while taking on an only slightly worse contract)