Well, here's a sequence of events I can think of...without giving specific dates:
-Iosif Dzhugashvili does not drop out of seminary in his native Georgia, thus continuing his education to priesthood.
-Sometime around the turn of the century, the Tsar (whoever he may be) decided to intensify the Russification of Georgia, forcing many educational institutions (including the seminary) to be under government control. Dzhugashvili decides to flee to Lemberg with his fiancée in Galicia to continue his priestly education. They got married a year after arriving in Galicia.
-During his stay in Lemberg, Dzhugashvili decided to defect to the Catholic Church upon exposure to the Catholics there. He was eventually ordained deacon, then priest for the Greek Archeparchy of Lemberg.
-After World War I, Lemberg was seized by Poland and became Lwow.
-During his time in Interbellum Poland, the Archeparch sent him and his family to Warsaw to advocate the rights of the Greek Catholic Church in Galicia. During his numerous travels to the Polish Cities, he met Karol Woytila and Maximilian Kolbe.
-Mrs. Dzhugashvili died in 1929 in Warsaw. He relinquished almost all of his personal properties to his now grown-up sons, wanting to devote the rest of his life to the priesthood.
-Around 1932, the Archeparch sent Dzhugashvili to Rome to be the Polish/Ukrainian Greek Catholic Church's representative there.
-Around 1935ish, Dzhugashvili was ordained a bishop, taking over as Archeparch of Lwow upon the death of the previous eparch. At the same year, he hears of the Holodomor in the neighbouring Ukraine. Using his influence, he managed to convince the Polish Government to denounce 'Stalin' (OTL Trotsky).
-1935 - 1939: Tens of thousands of Ukrainians sneak their way into Poland, risking death from the border guards of the Red Army. Most of these refugees found their way in Lwow.
-1939: As Archeparch Dzhugashvili was visiting Archbishop Sapieha in Krakow, 'Stalin' and Hitler invade Poland. Despite his wishes to return to his Soviet-occupied see in Lwow, the Polish Government and Catholic Clergy urged him to stay in Krakow, as they felt that the Nazis was the lesser of the two evils.
-1940: Archeparch Dzhugashvili fell into depression as he found out one of his sons was killed in combat fighting the Soviets. He thus devoted most of his time helping Sapieha run a clandestine seminary in Krakow, taking a particular interest in teaching Woytila.
-1942: Dzhugashvili learns about the Auschwitz Camp, and drawing from his experiences in helping the Ukrainians, made plans to try and save Jews in Poland.
-1945: As the Red Army sweep the Nazis away from Poland, Sapieha urged Dzhugashvili to flee to Rome, rightfully fearing that the Soviets would kill him. Dzhugashvili, wanting to return to his see for the final time, went to Lwow instead.
-1946: From the personal orders of 'Stalin', Dzhugashvili was shot by a firing squad for 'sedition', i.e. his role in smuggling Ukranians to Poland during the Holomodor.
-1978: Newly-elected Ioannes Paulus II began proceedings for the beatification and canonization of his former mentor, Archeparch Dzhugashvili of Lwow.
-1984: Dzhugashvili beatified as a martyr.
-1991: One month after the USSR dissolved, Dzhugashvili was canonized as St. Joseph of Lwow.