I don't know.
Could Hirohito (Suzuki, etc.) have been convinced by bombs dropped elsewhere?
(our physicists were able to back-of-the-envelope; should their physicists have needed hundreds of thousands of civilian deaths to calculate what an A-bomb could do?)
So I think it's not obvious (multiple books have been written on the subject) what could or should have been done or not done back then; now, from my point of view, those cards have been dealt, for good or for ill.
> Could Hirohito (Suzuki, etc.) have been convinced by bombs dropped elsewhere?
Not likely, Tokyo was firebombed to ashes and it didn't move him to surrender.
Hirohito was apparently convinced after the bomb on Hiroshima, the cabinet and military staff still wanted to fight on after the bomb on Nagasaki. They even tried to block his radio speech.
Personally, I think it was tragic, but there was not much choice. Forcing Japan to its knees by conventional means would have been a prolonged bloodbath (with the Soviets getting in the game as well), with probably a higher death toll.