I would do nothing to help the Lakers get Melo and James.
Don't worry, Lebron isn't leaving Miami.
He's opted out of his contract so that he can re-sign for a reduced amount, leaving Miami with some more salary flexibility. Wade and Bosh will do the same. I'm confident of this.
As much as Lebron was criticised for leaving Cleveland, he did stay there for quite a few years. Over those years the Cavs management tried to put a winning team around him, but never gave him a good enough roster to win a title. He left for Miami because he felt he had a better chance to win. He's already won two titles in Miami and the Heat management have proven to him that they will do what they have to do to build him a team that can win a title. He has the spotlight, he has two rings, he has the beaches, the glamour. He has two all-star teammates. Why leave all that?
Who really things Lebron and Melo would work in LA? They essentially have no PG since Nash is about a billion years old, nobody yet has a clue how Kobe is going to recover after the injury, and having three ball-dominant guys (like Kobe+Melo+Lebron in the same lineup is a recipe for disaster. So is the fact that those three guys would take up all of LA's cap space, leaving them with zero ability to sign a legit starting PG or C.
I'd be very shocked if Lebron goes to LA.