Even this seems a few steps too many, perhaps catered to your needs? Ubuntu or debian with KDE already has equivalents to all of those things. It's just 1. Ins

Even this seems a few steps too many, perhaps catered to your needs? Ubuntu or debian with KDE already has equivalents to all of those things. It's just 1. Install Kubuntu/Debian/KDE Neon 2. Start 3. Skip the installs, firefox is already there, KDE already has a good terminal and search 4. Keeping the default layout is fine because its already windows-ish but better 5. Don't install flatpak because it's not necessary for getting started, if ever