Sorry about the double getting tired, time for my afternoon pneumonia nap.
And then the OMG moment. I hadn’t caught this in looking at the pictures. This bike has lugs to internally route the shifter cables through beautiful lugs in the down tube, with what appears to be a lug in the BB for the front derailleur cable to exit, and a beautiful cut out (lug?) in the right side chain stay for the rear derailleur cable to exit.
Entry lug on down tube.
Exit lug for front derailleur cable in BB.
Exit lug (?) for rear derailleur cable.