Additional LED brake light?
 

Has anyone installed an additional rear brake light that is bright and flashes when braking?

Yes.
Very easy to do just connect to the same wires at the brake light.

Keep it as high as possible to grab attention.

Been working well for me.

Thanks redtape, ordered, strobe module and light 70euro, give me something to this week waiting for shitty weather to pass, if it helps with just one tailgater/traffic light dreamer it'll be worth it.

remember though when off-road it may attract bulls...

Good point!

I just got one of those flexible LED taillight strips in India when my original one died. 350 rs ($5.30) including installation and it's stuck right on the number plate. It does extra turn signal flashing as well so you can REALLY see when I'm going to turn. I'm not sure how legal it is back in the western world but totally worth it especially how pitiful my stock taillight was - I wish I had done it earlier!

I didn't, but I can answer from the electrician's side, since this is my field of activity