No way to realistically achieve it without invoking the ASBs, there are just too many random unions and anachronistic borders.
BTW, you're from Poland?
That's what I thought when I saw super Polish-Lithulania. (BTW, my grandparents are also Polish)
I don't think it's too unfeasible... Let's see...
US doesn't get involved with WWI, and takes more of a paficist tone.
Germany wins WWI (and the Kaiser is still in power), and combines a unified empire with Hungary. Croatia goes to Germany, Serbia and all points south go to the Caliphate. Germany annexes the Russian enclave (exclave?) by Poland as retribution. Other territorial concessions are also made for peace.
Britain was the most successful in the war, and had troops in Israel, Jordan, Syria and Lebanon. They strike a two-part deal with the Caliphate (who lost tons of money in the war). Since Britain lost the war, they will leave the area in exchange for Israel's independance, and give X amount of gold to the Caliphate.
Great Britain never passes the Government of Ireland Act (instead, different ways to resolve the internal strife are found).
Eastern Europe is initially conquered by the Soviets, including Finland.
Norway becomes one of the Soviet's proxy wars and is in a Civil War (north 'wins', and becomes communist).
Sweden/Denmark form the Scandanavian League, hoping to rebuff the Soviets.
France, Belgium, Netherlands, Luxembourgh, and Italy form a European Union after the Great Depression in the 30s as a western bloc against increasing Soviet-German tension.
Spain goes into a civil war. Facist Spain wins out against Communist Spain, and also conquers Portugal (tries to conquer Morroco, too). An Egyptian Caliphate forms in the 1970s to guard against powerful northern countries.
Between the 1940s, and 1980s, where WWII and the Cold War was supposed to have been, there is more of a regional cold war (nukes aren't as developed, and technology hasn't flourished as much due to lack of competition between superpowers), but there is another near economic depression, and the Eastern European states, led by Poland's Solidarity movement (had to get that in there!

), breaks away from Russia, forming a greater Polish-Lithulanian state.