I am sort of into lights, but I have to admit, I am not aware of one specifically designed to be aero. I think that would be hard to do, given the primary goals of a headlight. But maybe someone else is. The only one that possibly came to mind was the flatter profile Blackburn Countdown 1600, but I haven't used it and am just going by its picture.
https://www.competitivecyclist.com/b...BoCftEQAvD_BwE