I would assume you can do the same thing with the Giulia.
https://www.alfaowner.com/threads/stelvio-yes-you-can-lock-the-key-inside.1211525/#post-17851927 (https://www.alfaowner.com/threads/stelvio-yes-you-can-lock-the-key-inside.1211525/#post-17851927)
Just thought owners would like to know of this.