The Klein CAAD12

I'm trying to figure out how to bodge the gear cables. There's only one cable stop at the front, I was gonna cable it switch so the rear mech uses the stop and can run just inner cable through the frame. But then I would have an outer going inside for the front mech. I was sort of just hoping that the opening at the bottom bracket would be too small to fit an outer through so it acts like a stop but that's not ideal.