I think that they would have done. Japan believed that they had been backed into a corner regarding resources, this was a loss of face and the military who effectively ruled Japan would not back down. I know that the Japanese civilian diplomatic and political bodies were dead set against joining the pact in the first place and were urging peace.
It should be remembered that in 1932 the military assassinated a conservative Prime Minister. In 1935 an extreme rightist Lt Col Saburo Nagata assassinated the Chief of the War Office Lt Gen Tetsuzan Nagata. This was followed in 1936 by an attempted coup d'état when members of the Army killed four senior statesman. Finally in 1939 three cabinets fell and a new cabinet in 1940 headed by Admiral Yonai was formed and he did all he could to avoid the Tripartite Act. When the army realized that he would not let Japan join the Tripartite they caused the cabinet to fail again by refusing to nominate an Army representative which the constitution insisted should be represented.
Had the allies been aware of the internal situation and given the more moderate members of the government some rope by relaxing some of the financial restrictions then the civilians might have been able to stop the drive to war.