Allow font changes in edited text field

How can I make a text field that allows changing the overall font during edits? I do not want to support rich text, only the overall font should be able to change, basically what you get in NSTextView when richText==NO and allowsFontPanel==YES. Therefore setting allowsEditingTextAttributes to YES does not do what I want, because that sets richText to YES on the field editor.

Thanks,
Christiaan