Handlebar with channels for externally routed cables?

It isn’t. You need something that allows the metallic leads on the bottom of the Edge to be exposed through the mount.

What stem do you have? I used a k-edge initially that was designed for my Enve stem. I recently installed a redshift stem and used a Silca chisela mount as mentioned here. Good quality. Wish the combo mount underneath was further forward on mount, but I’ll be able to make it work.

It’s an S-Works Future stem

Thanks, do you know of a mount that would work for this?

Would the k-edge work with the External Battery Pack?

Not sure. I’m not familiar with how the battery packs work

I am currently setting up a Zipp SL80 Race handlebar on my Tarmac SL7 equipped with Shimano Di2 105. No issues so far.