Shift/Brake Cable Modular Hookups

Okay, this is very specific. I have a few bikes, & since I'm cheap & I gradually build up more bikes, I have been moving parts from older bikes to newer ones. One of the most painful things to redo is the handlebars: there can be a mix of brake systems (cantilever/dual pivot) & brifter/bar end shifter systems.

The underlying problem is cable housing lengths. For bar end shifters, I prefer to run the cables under the bar tape. Well, if I switch to brifters (already mounted as brake levers), then I have to strip the bar tape, rerun the housing, then rewrap the bar tape. I don't care about the weight of the cable housing or carrying it around without using it.

Or say I have cantilever brakes. The housing length is not going to be the same if I switch to dual pivot calipers. There's no way to extend the housing easily.

The solution is to have hookups for a modular setup. I can have shifter hookups for my bar end shifters hidden under the bar tape, & if I later want to switch to ba