We have dozens of fusion startups, and dozens of fission startups working on everything you suggested. The fusion startups build test reactors. The fission star

We have dozens of fusion startups, and dozens of fission startups working on everything you suggested. The fusion startups build test reactors. The fission startups do paper reactors and license applications, and in the US at least, if it's not a water-cooled solid uranium reactor, they probably won't get any further. Fix the NRC, and we might get somewhere with fission.