I personally would be fine with an open office if it were truly quiet. A monastic level of sound courtesy. No talking in the main room. No phone ring tones. No desk phones or phone conversations. Put sound isolated phone booths somewhere for calls. If there are doors or elevators nearby make sure they don't bang or beep when used.

I used to study in a big open, well lit room at the university library that was filled with people, but very quiet, and it was fine.

You would have to establish a culture of seriously chewing out people for making noise. The problem is, introverts are not likely to do that.

The only other factor is everybody has to have a proper wall to their back. Something in the mamillian brain freaks out when there are people moving about at your six.