Alright hear me out:
Heat start a soft rebuild post-Jimmy, turn Bam (who's having a down year) into Turner and significant draft capital. The emergence of Kel'el Ware also opens up moving Bam as a possibility.
Pacers have been pretty open that they probably won't resign Turner, so they turn him into Lively, their new center of the future for Haliburton. Klay is a nice shooter.
Mavs make a win-now move, add Bam to their core of Luka/ Kyrie/ PJ Washington. They get better now.