I proposed something like Love, 5 for Hayward, 14, 26 the other day and I still think that is a good trade for both teams. Boston gets into the top 5 and gets a better fitting veteran on the team. Love, Tatum, Brown, Smart, Walker is a better starting 5 than you'd otherwise have. You add someone like Toppin, Avdija, or Okongwu at 5 and still have Langford, Williams, Williams, Kanter, Theis, Semi, Wanamaker, and 30 on the bench. Cleveland gets out of Love, gets a short term veteran SF (something they need), and still ends up in the lottery and with another 1st.
Hayward won't opt in to get traded to CLE. This will never happen.
It would be Warriors or Pacers I think. At least a likely playoff team.