HyperStem / Internal Cable Routing / D-shape forks
HyperStem and HyperStem 1.25 feature a huge all-through direct opening from handlebarclamp to fork tube.
That allows to pass ICR brake hoses and the Di2 wires along on any properly D-shaped or Y-shaped fork tube.
Tech notes: check the flat side of your D is not wider than 26mm in order to avoid possible open spaces between the parts.
Clamping attitude is mainly related to surface quality and de-greasing (rather than bolt torque).
The suggested 2Nm is mainly intended as protection for the carbon components (a quite common weakness of industrial productions).