As I am a Pole myself, I'm wondering what made you choose enneagram 5 for Poland? Honestly, our country has not experienced any literary realism (like books of George Elliot) whatsoever. In fact all XIX century can be characterized as romanticism, then modified romanticism (Prus and its "Doll", called "positivism" in Poland; notwithstanding that's a book about a guy, who felt in tragic love to aristocratic lady) and then (BOOM!) modernism. Most important cultural ideas have always been romanticism, messianism, bravery, self-sacrifice and generosity. None of them fits enneagram 5.
In my view Poland is extremely 4-like, namely 4w3 sp. Our culture exhibits strange dualism. On the one hand, there is a great national pride in Polish people, on the other hand - they are secretly envying West its progress and wish they were placed in any other place of the world. There is a great dose of pessimism and fatalism in "this land" (as often called by Poles, when they, interchangeably, love it or hate it).
Other countries you typed:
Switzerland: 1w9 sp
Sweden: 9w1 so
England (if there is anything like "English culture" at all): 7w6 sp
Thailand: 2w1 sx (not sure)
China: 9w8 so (by all means)
Venezuela: 8w7 sx (maybe? not sure too)
USA: 3w2 so
France: 5w4 sx (very intellectual culture)
Italy: 2w3 sx
Japan: 1w2 sp (might disagree though)
Iran: 5 (might be)
Canada: would say 9w1 sp
Germany: 6w5 so
Spain: 8w7 so (might be 7w8 sx as well)
Saudi Arabia - it might shock you: 1w2 sx
Brazil: 7w6 so
Mexico: 8w7 sp (rather than so)
Austria: 4w3 sx
India: 4 (I cannot specify wing or variant)
Left: Russia, Scotland, Turkey (I have to think a bit about them)