Well, then we are in a endless loop now:

Nginx:

You should approach FreeBSD folks. It still doesn't offer this functionality.

FreeBSD:

Nginx is using reuseport this way appears to be an inappropriate use of that method. Linux hacked the wrong thing to make this work that way instead of using what they should have. Asking FreeBSD to do the wrong thing is asking a bit much, though I know you just want to use this thing.