Disabling Override in Address Box

I am open to doing this via Forms, Workflows, or Suitescript. None have worked for me so far.

On a transaction, a user can change the bill to or ship to address for a customer. We are having issues due to the users using the Override feature and not the normal "Address Line 1, City, State, Zip" lines. Therefore, we want to disable the override functionality. **The issue, to be clear, is in regards to how Avatax needs the zip code to be accurate 100% for it to do taxes accurately.

I cannot find this on any forms. I have tried workflows - I have disabled it on Before Record Load, Before User Edit, and Before field edit. I could not hide nor disable the Override button in any of these cases. I also tried hiding/disabling the Address free form text box they type in after they hit Override. I did this in all of the above stages as well as After Field Edit for when the Override button is pushed. Lastly, I attempted to just make the address fields mandatory. To do this, I tried setting Address Line 1, City,