Exum is ironically the biggest trade chip that the Jazz would probably be willing to part with to be honest. I don't see them moving on from Gobert/Mitchell/Ingles/Crowder and I think out of Exum or Rubio, Exum's contract provides more value than Ricky's expiring.
Exum to Phoenix makes sense for Phoenix but I have no idea what they would realistically give back. Maybe they throw Jackson in with Ariza or something but then we're down to Neto as a backup PG and the offense still has no one who can create beside Mitchell.
Exum/Favors/filler for Wall was another idea that my mates and I have floated around. Wasn't a big fan of it as even if the Jazz get all star engaged who can't party every night in SLC John Wall instead of whatever the **** he is now, I'm not sure he's a great fit beside Mitchell considering how little him and Beal were able to co-exist. I don't think the Jazz have enough to get the Wizards to part from Beal either.
Magic rolling the dice on him + Favors + whatever else (Allen maybe and at least a first) for Aaron Gordon if their season nose dives by the deadline and they want to see what they have in the Isaac/Bamba frontcourt could be an option but even then I think they trade Vucevic for a PG somewhere and keep Gordon/Isaac/Bamba as their big guy rotation.
Maaaaaaaaaybe the Bulls might want to part with Kris Dunn for Exum but I doubt it without extra incentives (maybe Exum + a protected 1st for Dunn and Holiday)
Exum + Favors for D'Angelo Russell maybe?
idk it's hard to think of a reasonable trade involving Exum tbh, but I'm convinced that he's the guy the Jazz will move if they make any sort of move for sure. Favors being included in the deal or done in a separate deal might happen but I think the Jazz are more inclined to keep him if they can and just play him more backup 5 minutes if they can.
edit: Exum is also the guy who's probably the worst fit in Quin's system, as I think if Exum has any consistent skills as an offensive player in the NBA it will be in a fast paced offense. Jazz being able to slow it down again by removing him and putting in a PG that doesn't mind playing slower makes sense too.