Taiki makes a good point, HeavyBombers are so over-matched in the games that they really have to be considered A-bombs. Taking that line of thought, simply create a higher costing bomber, say adding 5 to their cost and use only allow one purchased per turn, then use them as otherwise stated in the various editions of the game. Rather than recreate the whole A-bomb tech and development system, maybe it would be more simple to correct the broken aspect of H-bombers that we already have and implement them back into the game as A-bombers….
i would think you could let it all go after that, after all, Japan had two Nuke programs going to the US’ one.
The added aspect of A-bombs is the near instant death and destruction that they brought, vaporizing cities from the air is/was/can be a rather terrifying thought. Hiroshima and Nagasaki were smaller cities farther away from the capital that had been relatively left alone from earlier bombing and were not as densely populated as places like Tokyo, so when fire sweeps through densely packed buildings you get many deaths. when nukes explode and fire sweeps through more spread out and less densely packed buildings you get many deaths but less overall because of the lower numbers that started out, plus you get more survivors to hang on long enough to tell the horror stories of the mushroom clouds.