Push the POD back to the 40s and split the country like Germany. The Soviets did worse in WWII, or the Wallies did better. The line of control is further east and Czechoslovakia is split into a Czechoslovakian (Czech) Republic and Czechoslovakian (Slovakian) People's Republic by the Iron Curtain. When the Soviet Union and it's puppet states fall, the CSPR is overthrown and the two states reunite into Czechoslovakia.