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Well I figured out what I'll do... the solution was so simple... no need to shave the 3rd brake light... just get a blackout for it.
Be careful with the "blackout" since you can be rejected under this line:
9. The vehicle has unapproved lens or plastic covers, any other materials which are not original equipment or any colored material placed on or in front of rear lamps, license plate lamps and rear lamp combinations.
Brian, why not get one from another car that can go behind (inside) your back glass? Pretty much anything with a steep back window would work as a donor probably, or just rob the bezel and put an aftermarket LED light inside so it looks better than a bulb/reflector unit. Don't go without a 3rd light, just move it somewhere else.. Carbon bezel..hmm.