Interesting query! Have you found anyone to assist you yet? I've studied Austrian genealogy for over 20 years as my family originated in Burgenland (Tadten, Illmitz & Wallern). I wrote a short paper of one particular line of the family about how difficult their departure, crossing and arrival must have been.
By now you've probably finished your novel, but if I can be of any help, feel free to contact me,
Pat Gangl Dolan