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The safest and simplest way is just to take the outage while changing the interfaces to what you want them to be (make sure you have LOM/console access if you normally log on to the appliances through one of the interfaces you are touching), fix the topology in SmartConsole, unload the policy from the gateways and then push the updated policy out.
You'll have to fix any manual proxy ARP configuration and any other configuration specific to interface names (DHCP, management interface, like that) so make sure you thoroughly check the existing config first to find all that. Automatic proxy ARP will update when you push the updated policy out.
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