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got a photo of the frame?
EDIT - this?https://lfgss.microcosm.app/api/v1/files/dc1fa561372a2b0f3db447eda358dc8885c8ad8d.jpg
Tape it first for a mock up ride to see if the group is what you're into? then consider frame mods... will you run a quill stem or ahead adapter? is there a weep hole under the BB? is there a hole at the rear of the drop out? how thick are campagnolo electronic cables vs di2? I've used headphone cable and soldered my own for internal routing an external routed frame...
As that guy, I'd ask, what about the shifter bosses and chainstay cable stop? If you're going to leave those on, what's the point of going the hack on your frame to make it cleaner?
I went hard. No more cable stops. Wiring loom custom and captive to minimise hole size.
I really wouldn't consider this doable on a bike with shifter bosses. If it was ally, you could probably just unscrew them after breaking a glue bond, and there you have a big enough hole to pop a plug through, but it's a bit low down, and there are two of them... Meanders to a hard no. Steel of course will be brazed on.
I guess if you're prepared to have the frame repainted, the sky is the limit.