I’d say they can probably keep one of those three, maybe two if they manage to shed some money but at that point, they’re cutting their nose to spite their face.
This kind of makes sense in my head but:
Hunter and Reddish or Huerter for Barnes/Top 10 protected 1st
Barnes is on the same contract timeline as Gallo/Capela and probably improves their 2 year window they're currently on. They still keep one of their young wings and get a solid reset in 2023 with Trae/Collins signed long-term, Bogi on an expiring, Okongwu and an extra 1st from the Kings.
Kings fill the massive 3/4 void they currently have with 2 young wings on the Fox/Hali/Mitchell timeline. As long as you can ship Buddy out, paying Hunter/Reddish doesn't really affect the Kings booksmuch with Hali and Mitchell remaining affordable over the next 3 years.