I'll be doing the same thing at the 6-month visit with my car.
It can be deactivated via software. The Everyday Driver guys have a video about deactivating their GR86's noise maker at the dealership on their their YouTube channel. They show the service tech with a tablet plugged into the OBD port and after going through only a couple menus, it appears to be a simple setting toggle.
My dealership confirmed they can kill it on my BRZ as well. They didn't discuss price.
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