About Japan: Do remember that the Japanese had a very bad experience against USSR at Khalkhin Gol. It even could have been a second victory (just after Moscow) Russian victory against the Axe. Potentially, it could have change the political Chinese landscape much faster (linking with Mao Zedong). Japan had initial success against (mainly) USA because they were fighting the same war (naval and airplanes) with landing of Marines. Soon, it became obvious that the Japanese Land Forces were inadequate in term of equipment, material, logistic and tactic. Banzai attack against T34 would have been doom to failure.
“What do you think about the idea of making peace with Poland and France after the victory over France? Would GB been able to continue the war?” It would have depended on the terms, of course.
France signed an armistice, and as result, lost half of her territory, etc. Hitler knew that a peace treaty was just the seed of another war if Germany kept Alsace Lorraine, territories he couldn’t give back even if wouldn’t have been who he was…
Just look how the Countries who welcomed Germany as liberators in East Europe: Nazi ideology couldn’t accept a classical Peace treaty (we take part of your territory and we prepare for the next war).
Or, even worst, how Germany treated their allies…