[pvg]

historically only states "trustworthy" to the US or the former USSR were allowed access to the technology

Your own wikipedia link explains this isn't really true - the whole idea of the NPT framework is to trade assistance with civilian nuclear technology for giving up military use. There are definitely all sorts of Realpolitik factors involved but NPT signatories could and did build nuclear power plants. Who was Austria 'trusted' by to build Zwentendorf, if you think about it.