There is always a chance this could happen if the OP takes more time to think it out. The biggest issue IMO is that, to the best of my knowledge (and I in no way know everything), there is no shape shifting in starwars....yet.
This would be a food opportunity for bioware to add to swtor lore. What the OP explained could be used as an advanced class choice for Sith alchemist. The biggest trouble would be finding a way to make the republic counterpart.
Another idea is