With the current way zones work I do not think this is possible. From the guide:
- An IAP can belong to only one zone and only one zone can be configured on an SSID.
- If an SSID belongs to a zone, all IAPs in this zone can broadcast this SSID. If no IAP belongs to the zone configured on the SSID, the SSID is not broadcast.
- If an SSID does not belong to any zone, all IAPs can broadcast this SSID.
I also tried to create the same SSID twice and assign each instance of the SSID to a different zone, but it will not allow duplicate SSID to be created even with a different zone.