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They aren't designed for it at all, but the opening nearest to the shifters is quite large and near the corner so it's easy enough to thread up with the wires with time and patience.
On reflection I could have done this with my original ergonova bars but I never understood why my 'aero' bike came with ergonovas and have been itching to make the change since purchase.
Are those 3T bars designed for the new Di2 Y cable or did you need to drill it?
I'd be tempted to do the same thing but those aero-shaped bars are a bit pointless when I've got feedbags hanging off them :)
http://weightweenies.starbike.com/forum/viewtopic.php?t=142456