Maybe consider Henry Wallace replaces FDR after his death as President, instead of Truman. After all, Henry Wallace was more in line with FDR's perception that the U.S. and Russia could continue getting along post-WWII - Wallace promoted an open desire for Soviet/American cooperation!
Also keep in mind, Churchill had a lot to do with provoking and promoting the 'Red Army march through Western Europe' and of course, for his own political gain - 'the Iron Curtain descending across Europe.....' speech strategically in the U.S., which went a long way to inflame American paranoia and another 'Red Scare' 2.0.
(One must also remember that Truman fired Wallace for delivering a speech urging conciliatory policies toward the Soviet Union.)
As President and former Secretary of Commerce, Wallace realistically appreciates that the Soviet Union economy is exhausted and instigates the Marshall Plan to include the Soviet Union, which along with Wallace pulling Churchill into line and muzzling his red baiting, de-escalates tensions before they really start. I think it's often conveniently forgotten that that Britain and the U.S. agreed to many of the concessions that allowed the Soviet's to class Eastern Europe as buffer zone and spheres of influence. With much of Stalin's mistrust towards Britain and the U.S. rose when they reneged on these agreements.
Also another possibility of defusing East and West tensions is the implementation of the
Morgenthau plan by the allies. This entails Germany being de-industrialized as was originally planned by the allies (keeping in mind that much of Russia's fear and anxiety was that Germany had invaded Russia two times in 30-years and it was for good reason concerned it might occur a third time.....), including the abolishment of the German armed forces as well as all munitions factories and civilian industries that could support them. In other words, converting Germany to an agricultural and light industry economy!
Anyhow, just some thoughts.....
looking forward to what might derive in this scenario.
Regards
Pioneer