How to bring to life outer brake bulb on lci tail lights

[Crematoriant]

Hey.
My car is 2012s model with halogen lights so it had plastic tubes in tail lights instead of led tubes. And later I bought xenon lci tail lights and I used "jump wire" method to make those led tubes work.
So now leds have both function of daylights and braking lights. But that makes outer braking light bulb unused.
Anyone brought those outer bulbs back to life as a braking lights? (If so then how?)

My basic idea is to attach wire to a wire (which is connected to the trunk braking light) and connect it to the slot for outer bulbs. Sadly I don't know which cabels and connectors I need to buy and if it will even work. And I didn't find any DIY...