adamrice 

I haven't procured the test subject yet. I will probably do something very much like what OneIsAllYouNeed showed. AFAICT, FSA doesn't sell those exact brake levers anymore, but I'm pretty sure I saw scads of them on eBay. Barring that, I'll probably use cross levers—I'd like to have an excuse to put something from Paul Components on my bike, and they've got some smart cross levers. That wouldn't follow the curve up at the end of typical bullhorn bars, but there are also flat bullhorns.

Those Jtek levers are clever but look flimsy. It's hard to imagine something hanging off the side of a barcon being stout enough for a panic stop. And in any case, now that the company has been taken over by interests in the UK, they don't seem to trade directly with customers in the USA.