It is possible but there is some things are undefined/missing
The or part has som things undefined
groundespeek has sometimes different countries then the real world.
Is a cache with GBR for the UK ok to be used if it is in Northern Irland?
The list has the catch all for a continent: FFF Afrika
There has to be a list for all countries that are ok. One exist in the continet checher is it ok?
And there might be a problem for caches in Egypt where the regions dont follow the Suez canal
And the Spanish exclaves in Africa lite
https://coord.info/GC5P3DM and the Canary Islands are they ok as Africa.
And when Africa is there why is EEE Europe missing from the list?
It also exist here
https://en.wikipedia.org/wiki/List_of_NATO_country_codes
There might be other case when groundspeek considers it a country when the NATO codes does the same. And the other way