As far as I am aware, there is no way to do this. I'm in a similar situation on my Cisco 1711 router. Every time my WAN IP address changes, I need to update all my ip nat statements.
Regarding bridge mode e.g. one has a router-modem(as in 'home router' so it does NAT too and also a modem inside), and a router(i.e. a 'home/NAT router' with no modem), and one wants to connect them.
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