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Those shifter boss adaptors are definitely the go, IMO - without the barrel adjusters they're fairly minimal (and if you're keen, you can pare them down further); they're a proper part you expect to find in that spot; and if you drill out the right one and put a slot in it, you can jam the inline plug/socket into it, inline. Should look about as neat as it can, short of getting fancy with copper-traced sticky tape. You might consider black plastic Campy DT adaptors for a more stealth look and easier modification.
By "sleeve" do you mean super thin tubing that just encases the cable?
Yeah, it's definitely the go for anything with internal cables. If it doesn't come with sleeving, you should only have to fart around the once -then whenever you need to remove a cable, pop a length of sleeve on the end and push the sleeve through the frame or bars before removing the cable. Or if the end of the cable keeps getting stuck in the sleeve, you can carefully push the cable out with the sleeve.
To be fair we reused the existing bar tape so maybe no extra piece available.
But could have just used any old black tape ...
It will get fixed next time I wrap.
As for the brake cable, I am not sure that works due to the size of the entry points.
By "sleeve" do you mean super thin tubing that just encases the cable?
Anyway, no more work on it before going out for a fifty mile maiden voyage today.