Oh, you want to repress the Americans to accomodate Cubans in the name of stabiity. PU. That stinks.
Cuba under Castro is not a significant strategic problem for the US, the ongoing upsurge of Socialism in Central and South America is. Want to give rising tide of left-wing leaders a few tens of millions more supporters and an extra decade or two in office? Hand over the post-Communist transition in Cuba to the more radical members of the exile community.