Hi magma1447, many thanks for so prompt response.
May be it is a stupid idea, I wrote a code 25 years ago ;-) But, an addition of "new" country could be triggered by a log containing country missing in the P-GC list. It could generate a warning for Admin to add it (preferably for verification) or addition could be automatic (possibly).
By comparison of source code of Pocket Query page on GC website with the Top finders page on P-GC I found the following exotic differences, i.e. missing on P-GC (in brackets is number of caches in the country):
Burundi (3), Central African Republic (8), Cocos (Keeling) Islands (0), Eritrea (1), Guinea (1), Heard Island and McDonald Islands (0), Nauru (0), Netherlands Antilles (0), Solomon Island (5), South Georgia and the South Sandwich Islands (5), Syria (10), Tokelau (2), Tuvalu (2), and Western Sahara (3).
Greetings from Prague