Dynamo routing though cables+housing

Other than full external housing and a handful of frames with dedicated routing I've never seen a solution that I like. Tape, zip ties ect are unsatisfying.

I was imagining a special ferrule the has some plugs on it and internal contacts that touch the cable and the metal of the housing. The voltage is low enough it wouldn't be a hazard (remember old single wire dynamos) and there's enough conductor to make up for the poor conductivity of steel. I imagine the main issue might be corrosion.

Anyway, has this ever been a thing? Has anyone tried this? I figured if anyone has, someone here would know about it.

Also, if I make it work lemme on know if you'd buy something like this.