I made kind of the same joke here:

nostr:nevent1qvzqqqqqqypzq3huhccxt6h34eupz3jeynjgjgek8lel2f4adaea0svyk94a3njdqyghwumn8ghj7mn0wd68ytnhd9hx2tcppemhxue69uhkummn9ekx7mp0qqs9awpmr3ac9f6sydzsv06mfwyq04wfazjvh8eejjk5zptylns4accq9xy7w

But we have to figure out more then just fusion. Fusion uses the mass defect of light elements while fission uses the mass defect of heavy ones but neither of them achieves converting protons or neutrons into energy completely. Neutrons and protons are never destroyed in fusion or fission.