I’m afraid the API is missed and I have no idea of a workaround. I have found this in KB: SPR #:369795 -Would like to have API support for the New 'Display State' functionality in SW 2008 which is open and the DUP of SPR #:370065 - Unable to set the display state of a drawing view. So I assume first SPR requests all functionality of Display States including referenced display state in drawings.
Artem Taturevych, Application Engineer at Intercad (Australia)
translationXpert – add-in to translate SolidWorks models