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A seatpost mount would be fine if the light can still be quickly fitted to the on-off rack. I do want the light on the rack rather than saddle/post when the rack is in use because I often strap a drybag/tent/watermelon onto the top of the rack.
Pictured are the light and saddle mount I’m going to try. The front light is a B&M IQ-X.
A Son or Supernova seatpost light are neater, but (I think) can’t be moved between rack and saddle/seatpost.
I'm assuming it is something like an internal rear brake routing
Yes, basically. Quite like a traditional rear brake routing. In through the headtube and out just before the seatpost.
The TT routing is factory fit, through a tube.