If the vent isn't installed far from the main stack of the Nivito sink's vent pipe, you can install an AAV elsewhere. However, note that this solution is not universally accepted by state building codes, so you should check the local building codes before attempting to install one. If you have the money and time to do it yourself, you can install an AAV far from the main vent stack. Just make sure to turn off the water to the sink and grab a bucket to catch any water that may flow out. Alternatively, you can remove the trap arm and bend from the sink and place it into a bucket.