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Can you not just plug the sprint buttons directly into the second/third port of the shifters? Give it a test but pretty sure you can do that especially with dura ace levers.
@onyerbike
Don't need to drill carbon bars that already have internal wiring so long as the middle (stem) and drop corners aren't re-enforced (blocked up)....
on first attempt it may seem that they are blocked but I bent the end of an outer brake cable up slightly and did a lot of frustrated stabbing in order to path it through, I replaced this with string, made all the needed paths up that way and then pulled through the Y cable as needed.
Pretty happy with final result
I forgot about my TT shifters - if I use all that new-fangled Y-cable and PRO stem and bars, I'm still going to have two TT shifters to wire in. How will I hide their wires? Can they be fed into the stem or am I still going to need that junction box under the stem arrangement I have now (albeit with a 3-port not 5-port)?