How about this deal which does work in trade checker & maybe it is doable.

Celtics receive: Andrew Bynum, Metta World & (Odom's) Trade exception

Lakers receive: Paul Pierce, Rajon Rondo & Jermaine O'Neal

Why for Boston? You are always correct in starting a franchise fresh with a young dominant center. Boston is clearly rebuilding & this helps that process go smoother & faster by not having to worry about Dwight Howard in the summer. We could still go after him but the PG position would be WIDE OPEN for D-Will to play with a dominant young big man he could grow with.
And a lineup of:

PG: Deron Williams
SG: Ray Allen (smaller contract)
SF: Pietrus-M.W.P or draft pick
PF: Garnett(1yr 3mil) or hopefully strike gold with Josh Smith
C : Andrew Bynum

Why for L.A.? It would make them title contenders for sure & give Kobe a true PG he always needed & also give him another scoring threat from all over the floor he never had before & would make their offense dynamic & all allow Gasol to get his post touches again. With Bynum this year Gasol has become too outside oriented. Personally I think Pierce would play out of his mind if given this opportunity to play at home & that alone would make the trade worthwhile for L.A., Kobe wants rings & Pierce would help hime with that! And this trade opens up the center position to go after D-Howard in the summer if Howard wants to come. They could amnesty either Pierce or Gasol to free up the money for Howard & they are back up & at it.

Laker lineup after trade.

PG: Rajon Rondo
SG: Kobe Bryant
SF: Paul Pierce
PF: Pau Gasol
C : Jermaine O'Neal

That looks like a title favorite this year & its a win win for both organizations!