I've been thinking about how you'd incorporate a finding with the souffle pearls ever since I read about them, as many of you have I'm sure.
The best I've come up with is to take an eyepin and in a reverse form of wire wrapping, make a flat, wide spiral, twirl the spiral into the pearl up to the eye, then bend the eye. I think you've called it breaking the neck (or shoulder?); I'll have to check back to see who posted this neck/shoulder-breaking, for my memory has failed me.
Then maybe a little bead of fixant - glue, solder, whatever the experienced posters here think is best.
The spiral spreads the support over a wider area inside the top of the pearl, minimizing pinpoint-stress. I'd like to think that also minimizes the chance of fracturing the pearl as well, and the pearl shouldn't be likely to fall off should the entry hole enlarge.
If you want a bead cap to cover the mechanics, use plain wire and after forming and placing the spiral inside, form your own eye after placing the bead cap, I suppose. Course, this would only work with a dangle.
How could you mount one on a stud?
OK, I bet there's potential for patenting a new type of stud with a spiral instead of post for mounting the pearl; cup-and-spiral instead of cup-and-post. You read it here first! or, I wonder if it's already been done...I bet the Chinese have already got a patent in the works, since they've been working on the souffles since their inception.