I would like to allow only one country access, but exclude proxies within this country.
This is what I have (shortened version for convenience)
Change your code to
deny from all
allow from 139.82.0.0/16
allow from 143.54.0.0/16
allow from 186.192.0.0/11
allow from 186.224.0.0/11
This way your htaccess will deny every except those that you explicitly allow with allow from..
A proxy within the allow range can easily be overwritten with an additional deny from..
rule.