radosgw, public and private access on the same cluster ?

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Hi everyone, we have a ceph cluster for object storage only, the rgws are accessible from the internet, and everything is ok.

Now, one of our team/client required that their data should not ever be accessible from the internet. 
In any case of security bug/breach/whatever, they want to limit the access to their data from the local network.

Before creating a second "private" cluster, is there a way to achieve this on our current "public" cluster?

Is a multi-zone without replication would help me with that?

A public rgws for public access on the "pub_zone", and a private rgws for private access on the "prv_zone"?

    pubzone.rgw.buckets.data
    prvzone.rgw.buckets.data

If the "public" rgws is hacked, without the access_key/secret_key of the private zone, is there any possibilities to access the private zone?

Does a multi-realms would help me to secure it more?

Any input would be really appreciated.

I don't want to put to much energy for false security and/or security by obscurity, 
so if these scenarios of multi-sites/multi-realms are useless, in a security point of view, please tell me. :-)

Thanks!
JS
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