Option to manually specify the announced IP address for the server?

You can. See @Volts earlier post:

The ‘guid’ is your certificate UUID, as found in your Plex Media Server preferences file (or the Windows registry). This post describes how to find it:

Once you’ve got that, you can compose the custom server access URL as described above:

https://desired_ip_address.[CertificateUUID].plex.direct:[port]

This will be published as a server access URL which your clients can then access (using secure connections).

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