If you research Rohloff hub failures, there are lots of cases cited on the internet where a spoke came out of the flange from a cracked flange. And then you are kind of screwed because the wheel will not true missing a spoke with the wide angles. It is my understanding that the issue is not so much the angles, but that Rohloff makes the hub shells from a process other than forging. Maybe I have that wrong, I am relying on memory from what I read years ago.
I used Sapim nipples even though I had a rim drilled for Rohloff, for the reason you cite.
Thanks for the info: I will investigate this subject further.