I would love to have "defectors". So I can fks. roll a chiss imperial agent and defect to the republic =) Maybe that is something that will come in the future, could make good stories.
And when it comes to the chiss & mirialan on oppsite sides of what they are now, I guess that there are always people within the races that likes imperials and republic. Defectors you know ;> Not all of the mirialans are good, and not all the chiss are bad, to say in a simpel way.