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Di2 sheath would be tidier, getting sugru off the frame cleanly after is a bit of a pain.
I'm rebuilding the bike onto a CDF at the moment, i'm planning to mount a light on the mudguard instead, and my front will go off the hole on the fork rather than on the bars.
If you decide to go this route and are ordering other lights etc, we could trade, if you order me a fender mounting Secula you can have my stay mounted one and the handlebar light bracket.
You can see the stay mounted light in this image, quite a tidy solution given the restrictions, I used sugru to run the cables and just wrapped an old inner tube round the stays to give the right diameter for the light to sit right.