$remote_country is interesting idea, you classify visitor into per-country "buckets". Although the buckets would not be of equal size. If you have a single regular visitor from a tiny country, $remote_country could uniquely identify them.

A similar idea would be to have built-in $remote_addr_hash8, $remote_addr_hash16 variables which hash IPv4 and IPv6 addresses down to 8-bit or 16-bit numbers.

There are hacky ways you can do some forms of anonymization already:

https://www.supertechcrew.com/anonymizing-logs-nginx-apache/