https://greyman-tactical.com/
Rigid MOLLE panels of all sizes and shapes. If you're ok riveting to your door, these would probably be great. I do not work for this company, just use some of their products.
Similar to this method, I did this all by emailing several different dealers. I used our USAA car buying service and had multiple dealers email me their prices. I collected their names and emails, then put them all on a blind cc'd email back to everyone and said, "Whoever offers the lowest price...
Do you have the Proximity key? In that case, every time you walk back and pull the handle, the car will automatically unlock if it senses the key nearby. That's the idea.
Lock it, put your key down far away, and check it without the proximity key nearby.