lol it wouldn't be a few
i think it was the CIA that estimated that israel has had a nuke stockpile ranging from several dozen to hundereds from 1970s-present.
I do wonder just how effective tac nukes would be though.
Well "a few" was a relative term comparing the one-sided bombing of Israel's enemies in the Middle East, and a full USA vs. USSR(+their allies?) ICBM cluster f*ck all over the world.
I could see that being an expansion pack, or even a "sub game" but it would be pretty hard to simulate proxy wars, mid 20th century economy, and arms races along with post apocalyptic resource management, fallout, and god knows what else.
But wouldn't the damage the nukes do destroying infrastructure, irradiating resources, and killing POPs interacting with the game's economy system do the work for "post-apocalyptic resource management" if the war was big enough? maybe having a "Nuclear Winter" event that impacts output of Crops(and solar panels if those exist in the game) world wide if enough high-yield nukes are detonated at the same time.