I'm definitely game to do this with you. The idea of a Twi'lek female who not only isn't a slave but a full on dominating Sith is both rare and also quite intreguing. I wonder if you've thought of much of a background for her? The immediate thought that came to mind was maybe that she was a typical Twi-lek sex slave/dancer but then her force powers manifested and she escaped, leading to the bounty. By the time that she is tracked down, she's developed into a full Sith mistress, or at least one who can easily handle a non-force using bounty hunter.
I don't have much of an idea of exactly what my Hunter will be like, so if you have any specific ideas about him to incorporate I'd be happy to listen. I'll get to thinking about him though