These all make me think about developing multi-level encounter tables to add some more mystique to meeting members of other OTU cultures. Have an Aslan table, a Vargr table, even a Human table (for those non-human PC's).
I think it would create more of a sense of "alien-ness" if you never knew what the outcome of an encounter might be. On day you might end up making friends, the other, you're in the gutter with a head wound.