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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.
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If you want to run the same light to a rack and seat post/saddle, my guess is you'll need an extension of wire for the rack option.
If it were me I'd have a SON coaxial connector where it comes out of the frame. Into this plug the seat post mounted light when not using the rack, or plug in the rack mounted option when you have the rack on.
hmmm. Are you set on saddle mounted or would you consider something like the SON seat post mount? Could be quite tidy if you ran cable into this TT internal routing (still struggling to picture it, I'm assuming it is something like an internal rear brake routing).