You could maybe cable it into the hole of where the barrel adjuster is? And then route it back out of where the BB cable guides are
The only way I would like to do it is full internal which would require a new fork, an ahead setup and drilling. Using the hole in the BB would also be the only option to not drill in the frame.
Or full retard eTAP AXS.
@LeMesjeu started
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You could maybe cable it into the hole of where the barrel adjuster is? And then route it back out of where the BB cable guides are