Why not? Plutonium supremacy? ;)
It would take longer and use more energy but the boom is the same in the end. Did Germany ever have a breeder/dual use reactor? If not you'd have to build one first anyway and i bet that takes longer than building a shitton of centrifuges.
And isn't the issue with a credible nuclear deterrence the delivery and second strike capability anyway? Germany would need submarines and icbms too.
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