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Yeah you could go with the RS910 bar end junction and run the wires through some bars with the holes already in them (or underneath the bar tape). Then use a PRO tharsis stem to hide the wires until you steerer. Make the wire go from the stem into your downtube and hide the b-junction in your downtube.
You'll see just a tiny wire from your stem to your downtube
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PRO have made a new stem for Di2 integration, but I think it's pretty new and not commonly available, don't really know what it does...
http://www.pro-bikegear.com/global/en-gb/road/stems/PRO_SS_VIBE
@hoops you want the job? I trust you to fuck it up in the correct way.
I'm not sure if I trust myself to drill the steerer - what's the next best way to hide ya cables, hide ya boxes?