Blind spot mirror

I’d like a blind spot indicator in the side mirrors.  The side mirror glass is easy to replace.  I don’t care about the side mirror auto dim feature.  I wonder if the wiring for the auto-dimming feature could be used to light a blind spot warning LED embedded in a blind spot replacement mirror glass instead.  Tesla writes the appropriate software and you check a configuration box whether you have the blind spot mirror or the auto-dimming mirror installed.  When a car is in the blind spot, the LED is lit.