Not really. i've been to only few clubs in Vienna. The only one of those that had a good atmosphere and was visited by a high number of couples when i was there was
Club Le Swing. They host "themed evenings" but i think they organize those themselves. Not sure if they also host events arranged by a third party.
And i haven't seen anything themed "interracial" there yet. (Actually a reason to go there
) i think best would be to just call and ask the operators. Maybe it helps when you tell them that your parties are successful in Germany already? - just a thought.
Other than that try
Club Coronita in Graz if that's not too far in the south. But i would prefer something more in the middle of Austria (maybe Salzburg) that's within reach for those living in the eastern parts as well as those in the western parts of the country. Anyway you'll be kind of a missionary - unfortunately the swinger's scene is
not big in Austria.