Can I globally subscribe/unsubscribe a contact using the Bulk API?

I'm using E10 and Bulk API 1.0, and I'm trying to globally subscribe/unsubscribe (as seen on the Preferences tab on a contact's details) a large number of contacts using the Bulk API. Using the SyncActions (as described here: Bulk API How To : Create the definition for your Import), I can subscribe/unsubscribe from specific email groups, but I haven't figured out how to do this for the global preference. I've tried leaving off the destinationUri in the SyncAction and setting it to null or empty, but it returns an error saying that the destinationUri is required or invalid.

Is this possible? If so, how?

Thanks!