Let me draw your attention to "Tacit Knowledge, Weapons Design, and the Uninvention of Nuclear Weapons" (1995)[0]. Basically, it takes a nation state 4 years to develop its first nuclear weapon, and no amount of explicit knowledge-sharing speeds up the process. The only thing that speeds up the process is sharing tacit knowledge by embedding a nuclear scientist who has already been through the process.
[0] https://apps.dtic.mil/sti/pdfs/AD1018881.pdf