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Thanks @danstuff - that's the only routing I could think of.
Remove the headtube cable guides, get a 6mm Di2 grommet and run the cable through that hole then around the fork steerer and through the downtube.
The routing isn't the smoothest but you've done a great job with the heatshrink so I will use that idea to keep things tidier.
I have ordered a K-Edge junction box holder/spacer.
EDIT: My rear brake cable routing is also external. I am now remembering that I need to purchase hydro cable clamps...
Vince
Those show the routing. Di2 cables attach to brake hoses with heatshrink, all going to and from a 3 port Junction A box on a Fourier mount.