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All of them
3T Carbon (various types) - won't even take 3nm at the clamp without crushing (recommended to 5nm)
All of the new PRO Vibe (none of them are actually designed for internal cable routing unless your Di2 is stem/steerer fed and even so there's no access at hood/sti)
Bontrager VR shit Aero things - look more of a pooey boomerang than the SuperZero and weigh more than me
Very welcome for any other suggestions as I'm desperate for a set of Alloy compacts that don't look like a shitty banana but at the moment the SuperZero are the only worthwhile option I've found that will ACTUALLY accommodate internal routing!
You don't need the Y-Cable
Just link the two shifters with one cable, then take a cable from the left shifter (or the right - I say left as my handlebar-end junction is on the left) and link it to the junction.
I can only see the Y-cable making cabling a lot harder/more awkward and it's an unnecessary expense.
The only problem I'm having right now is that there are no bloody bastard decent handlebars with proper internal routing. I reckon I've bought (and returned) every pair currently available apart from the Deda SuperZero, which the internal cable routing is bloody awesome in - shame they look like a turdey boomerang.