I'm not sure Wookiees on Nar Shaddaa would be a good idea. The convo with Mira indicates that Wookiees are generally unknown and that Hanharr is something of a unique specimen (as a species, not just that he is a psycho). The player can even indicate they have never heard of the species. Maybe you could have a couple on Citadel Station, helping the Ithorians out. That would be doubly beneficial, as you could easily splice in references to them in the Ithorian dialogue without worrying about VO. Anywhere else though strikes me as similarly out of place as Nar Shaddaa.