Chiang could join SEATO, that could certainly help the organization survive and gain more legitimacy. I’d think the Soviets would have probably just have pivoted towards the Middle East and Africa, maybe even India. Honestly, the Cold War May have been even cooler, but the USA was looking for a enemy in the Soviets and they were more or less gonna find one. The American government had already mostly pivoted to communism being the major foreign and domestic threat by the time of the Marshall Plan. IOTL it was China, but it could have easily have been Hungary, Cuba or Iran that sparked the Red Scare.