There are already third party garages offering to unlock various things for less than Tesla wants (or upgrades Tesla simply doesn't sell). They tend to involve

There are already third party garages offering to unlock various things for less than Tesla wants (or upgrades Tesla simply doesn't sell). They tend to involve a gizmo intercepting can messages though. The gizmo is usually keyed to the serial number of the car so you can't clone/move/resell them.