So, I think the Di2 electric lines are just like aero drop bar with openings.....right???
Maybe check out the Race Face carbon fiber aero drop bar??? I have one..but it is made in China.......from seller on Aliexpress. It is the "NEXT" model of RACEFACE brand.
I am using it on my road bicycle now. Maybe this is the kind you need???
IF you really need a hole near the bar end, you can make one yourself on this carbon fiber frame, which will be a lot easier then doing on a metal bar.
Maybe you did not have to return that ZIPP drop bar if you did like it. I had done a bit testing slow and short distance riding on the NEXT drop bar and it feels good. Just.....you have to dig around to set up the internal cable routing yourself......