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Yeah.
That's the thing with an integrated 'constructeur' approach, that chainstay braze-on for a Cyclo (or Nivex) derailleur becomes obsolete.
It's kind of glorious though.
Ed committed to a 46ish chainring with a braze on FD hanger but the way he's spec'd the bike shows he's thought it all through.
Deciding between future flexibility and integrated neatness on a custom frame is an impossible dilemma I'm not likely to have to confront. Unfortunately.
The good thing about detachable cable hanger as opposed to a brazed on one that could be otherwise located, or a drilled seat post, is that if you decide to switch to V-brakes you don't end up with a redundant fitting / hole in the frame. Don't know if that's why Ed did this though (loosely looked at the -great- pictures of this thread)