Anyone got a non-SL carbon Procaliber that can confirm if it has internal routing for a dropper or not?

Assuming you’re looking at the 9.7 which is the only non SL carbon, I would say no. If the photos on the Trek site are accurate then only the front mech has internal cable routing. If you ditched the double up front for a single then you could use that port to run a dropper internally.

Cheers Alex. Also heard back from shop who said, “The Frame is set up for a Stealth Dropper post, the hose/cable come out of the seat tube just above the BB, the hose/cable will then route to the bars with the other cables.”.