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The frame is aluminium so I wont drill holes in it. But I have thought of the second best solution: fairings! I have access to a plastic 3d printer and have previously toyed around with the idea of various aero profiles where the hose could run inside.
Some test for the old pompetamine frame:

There is still the problem of weight (could be a lot of abs plastic) and time to make it.
svenhöek
@Alecfr
Wow Nice for the disc brakes :) ! Could you do holes for internal cable passage ? Or is it okay for you Like that ? (Sorry for the mistakes my english is not perfect)