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There is a <div> with the data-view attribute called "ProfileInformation.CustomFields." I can add fields there in an SC extension and they'll show up in the profileinformation fragment in my_account, but I don't know how to actually save the data in those fields. Anyone ever done this?

So I just don't think there's a way to do this with the Extensibility API. We'll need to wrap the Profile.Model and/or Profile.Information.View.