Any hot air station works just fine if you have a a preheater.
If you don't have a preheater, then slowly heat the whole aluminium PCB for a couple of minutes with hot air circling above the PCB, but without reaching the melting point. 100-150 *C will be enough. Then turn up the air temperature and heat only the LEDs you want to be removed. Pick them up with some metal tweezers after the solder has melted. Do not apply any force.
For soldering, use the same technique. Before preheating, put some solder paste on all 3 soldering point on the PCB, and some extra flux. If you have a steady hand, then you can press down the LED after the solder paste has activated, for a better thermal contact. Otherwise, it will do just fine without pressing down the LED.
I just did that a couple of days ago, mostly to see if the hot air station has enough heating power. During desoldering/soldering, the aluminium PCB was standing all the time on a thick wooden block to conserve the heat. The wooden block gain some burnt marks, but the LEDs were way cleaner than the ones from the picture above, even after desoldering then soldering them back twice. The ones from the pic looks like they were very, very overheated. Good luck!