There is a small plug under the front of the driver's seat with a black and a green/black pair of wires leading to S68/1 in the driver's seat buckle. Those leads are connected when the seatbelt is unbuckled, buckling the seatbelt opens the connection.
Unplugging the small plug should prevent the seatbelt from triggering the buzzer.
The seatbelt warning light only works off a timer, so that should still work for you.
Keep in mind the buzzer still should work with the key in the ignition by S8/2 and with the lights on. Ground is supplied those two items is supplied from the left front door when open by S17/3. When the ignition key is in the 2 or 3 position power goes to the buzzer controller to cancel only those two items.
Bottom line: try unplugging the small plug under the front of the driver's seat.
Let us know if this works.
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