Im sorry but I'm afraid I don't understand the question. It is true that the rv220w is EOL, but the replacement, the rv130w also has the ONE to ONE NAT feature which will allow you to use multiple public ip addresses on the LAN.
You will find the feature under the firewall tab. Here is a link to the emulator page for that router.
Thank you for using the Cisco Small Business Forums. My name is Andrew and I am an eSupport Content Developer in the Small Business Support Community. I was wondering if you could clarify what you mean by "support multiple public IP's". Are you looking for a router with One-to-One NAT capability, that would map public IPs to devices connected to it? Or are you perhaps looking for a Dual WAN Router such as the new RV325 Dual Gigabit WAN VPN Router that would allow you to connect to two ISPs?
The RV130W supports One-to-One NAT. If that is what you are looking for, here's an article on the Cisco Knowledge Base on how to configure it. Hope this helps.