Nets get shooting to put around Simmons (& Russ presumably)and get all the 1sts the Heat can offer (which would probably be completely unprotected to entice the Nets, like the Hawks-Spurs trade).
Kings get Tobi (who they’ve been linked to trade rumors with all season.) and 2 2nds.
76ers get Kyle Lowry (point guard that can run the offense or play off the ball & is a “dog”.) and Holmes (great back up center that could start if Embiid injury).
Heat get KD (obviously) and Terence Davis (salary filler for Kings & depth for Heat).
I’m not saying I’d do this trade, but it’s the best the Heat can give and I believe the most realistic (if Heat get KD).