I can’t seem to get anything more than the inner and teflon liner from Nokon cables in there, I’ve tried standard cable outers too.
I do suspect even if successful then the gap between the bars and the top of the break will be too small.
I think your frame is smaller than mine, but on a 56cm frame with slammed Ventus I seem to have enough space between the bottom of the bars and the top of the brake.
Re your hope that you can get away with a gap in the links I don’t think it’ll work, even a straight 3 link shortage in one attempt meant any corners further meant the cable couldn’t return so the brake stayed on!
This is roughly where I’m at at the moment. I’ve threaded the beads onto the Teflon liner from both ends and rigged everything up apart from the actual cable. I’ve tried feeding some dummy cable through the system and it feels like there is a kink inside the bars where I’d expect the gap in the cable outers to be. I can get it through, but the cable run is definitely not smooth.
I have to take a break now but I’ll try with a section of proper cable later, however, my Vision brake levers only work with stupid proprietary cables and I only have one, so I’m hesitant to fray it or put a kink in it while fucking about trying to test if this routing is even possible.