I just realized that the Tak'a'dis are a great source of possible sub factions. Being master gene-crafters and manipulators.

If someone wants a race, they could be a personal experimentation, escaped test subject or a previous slave race that wasn't up to snuff.
Or one could create a species which shared Joord but were forced to leave hundreds of years ago.

The Tak'a'dis having had space travel for a very long time, while also focusing on small nimble fast craft makes daring escapes very plausible.