nekorpm is single offline installer for Fedora. Use nekorpm with .nekorpm file. If you want to test nekorpm, then you can download some .nekorpm file at nekorpm repo
USER: Open your terminal and run this command "sudo dnf copr enable alunux/nekorpm && sudo dnf install nekorpm"
Packager: Open your terminal and run this command "sudo dnf copr enable alunux/nekorpm && sudo dnf install nekorpm-pack"