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Consider: What is North Korea's nuclear command and control protocol for Kim Jong-un leaving the country? Everything we know suggests DPRK's peacetime C2 is monolithic, centralized, and assertive. Does DPRK have a "football" equivalent for Kim? (Likely not.)
You only need a "football" if you take certain things for granted, e.g., that the authority should always be centralized in one person, and that you fear others misusing it. US didn't take those for granted for awhile; Soviets didn't for a long time, apparently.
A more trivial thing to do is what the Soviets supposedly did in their pre-"cheget"/football years: the Politburo could designate some top military officer as Supreme Commander and give them the authority in times of uncertainty.
This kind of thing makes Americans uneasy, but that's partially just cultural. We like a nice split to exist between military and political aspects of nukes, but that's an artifact of our political system in part. We fear rogue generals; an authoritarian state may not.
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