There is no way that Miami gives up Bosh for Gasol. No chance at all. Now if you added in a third team, it may be more likely.
Maybe something like this:
Minny gets Gasol
LAL gets Bosh
Miami gets Pekovic, Williams, Barea, LAL 1st
Why? Minnesota gets Pau a guy they want. The Lakers get a younger healthier and cheaper version of Gasol. The Heat get a true legit center, a recent very high draft pick that is a combo forward (a much much poorer version of Lebron), a nice quality backup guard for both the 1 and 2, and a draft pick.
That said while I think this would work for all 3 teams, I don't see any reason why the Heat would trade Bosh coming off of a title run in which Bosh was a big part of the success.