Well, 1st off, for now the Stiletto is next to useless in regular combat. It gets outclassed by the most-used VHFs like the Sabre or Eagle.
But if ya want to get it anyway, just a matter of careful shoting. Enough to get the desired faction neutral, but not too much to turn every lawful red.
A bribe followd by "redempting" shootout is also a way.
In other words, you need to play a baddie for a nick of time if you want that ship.