I used one of these. Cost around $5. Its intended for scooters, but I just made up a mounting and it fits in well. You can hardly notice it until it lights up. Works great, but I did have to run dedicated wires.Leave it! I don't think the 3rd brake light flashing is all together bad. Anything up to throwing things at the people behind us is not a horrible idea! Now if that light had two elements that could be divided L/R would be even better
We have amber turn signals here.