If you acquire Murray, you have to move Smart elsewhere.
Just tinkering around I came up with this
Celtics - Murray, McDermott, LeVert
Cavaliers - Smart, Stauskas, Morgan
Spurs - Love, Nesmith, Pritchard, Cavs 23, Bos 23, Bos 25, swap Bos 24
So Post-Trade Boston's 2-Deep roster
PG - Murray, White
SG - Brown, LeVert
SF - Tatum, Grant
PF - Horford, McDermott
C - Rob, Theis
Deep Bench/2W - FA, Kornet, Fitts, Ryan, Thomas, Hauser, Davison
That is a lot to give up, but that team would check all of the boxes upgrading not only the 3rd player from Smart to Murray, but also adding quality depth (and some shooting) to the bench in LeVert and McDermott (who both hopefully can stay healthier coming off the bench).
The Cavs clear a ton of cap room to re-sign Sexton and then have an excellent trio of guards in Garland, Smart, and Sexton to go along with their triple 7 footers in Allen, Mobley, Markkanen while still having Okoro, Osman, Agbaji, and Wade for bench depth.
The Spurs take on Love for the year to clear out McDermott, but pick up 3 1st's and 2 recent 1st rounders to really amp up their rebuild.
Trade at least in theory would make sense for all 3 teams, though I'm not sure any of them do it.