Dear KMII,
Thank you for your first impressions. I am convinced that I could easily share some of your feelings, but sadly no LUC Sport in my reach to prove me right or wrong. 
I'm truly happy that you decided to extend your Chopard collection with such a specific piece of the past. It's not that old, but whatever number is out there, it won't get more.
Interesting enough, it was your post only that made me aware that some movements that use the base calibre 1.96 don't hack. I did a quick research and apparently both 3.96 and 4.96 don't hack. Until so far, I thought the differences were cosmetics/finishing only.
The 1.96 does hack and my 96QT was just tested and it does it to. Yet, I wonder if there are other movements with other differences in the principal calibre functions?
Thank you very much and keep on smiling with your running LUC seconds hand. 
Best regards,
Kolosstt