Hi,
I can see two ways to do this.
Either change your design to flexconenct on both sites so you have the same configuration everywhere.
Or place the AP in Flexconnect mode but have the SSID on site1 as a local SSID. But on site2 the SSID as a Flexconnect SSID and a Flexconnect group for the APs so the correct vlan is punched to the AP. This way if the AP is on site1 it will tunnel the traffic to the WLC as usually but when moving to site2 the traffic will be locally dropped by the AP to the LAN on site1.
regards,
Jonas
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