Yes you can do it; only make sure that you:
- Create a wired interface in a foreing WLC.
- Create a Guest LAN and select the wired interface as ingress and management interface as egress interface.
- In the anchor, create the same Guest VLAN; with management as ingress interface and your internet dynamic interface as egress interface.
Don´t forget select in the Guest LAN of the foreing WLC the anchor controller as a anchor for this Guest LAN and in the anchor WLC to itself as anchor WLC (nice tongue twisters )
Best Regards.