Front Air Bag Sensor Control problems of the 2004 Toyota Sequoia

Takata recall Toyota customer service and my local Toyota have been unable to remedy this defect in the last 3 weeks nor can they tell me when they might be able to. My answer is always, "the part is on backorder". I was also told by Toyota customer service that my vehicle was safe to drive as long as there was no one in the passenger seat, that there were sensors that would not allow it to deploy if there was no weight in the passenger. I have specific questions: 1. Are there sensors on a 2004 model 2. Is my vehicle safe to drive with no one in the passenger seat 3. Does Toyota in fact have a priority system set up for owners who live in high moisture areas. 4. If vehicles can be traded from dealership to dealership why can's parts? I have contacted Toyota customer service twice (case # 1604290026) who put me in contact with dealership customer service, which simply transferred me back to the parts department, who again told me parts are on back order, call back again. My first step was to call the Toyota hot line for the recall, confirm dealership had part, and schedule to get it repaired. When I arrived at the dealership I was told they did not have the part. Simply put, is my vehicle safe to drive because I have made every effort to get the repair accomplished.