Two minutes of setup, then a download you start once and leave running.
xattr -dr com.apple.quarantine \ "/Applications/Model Studio.app"
Budget about 12 GB and twenty minutes before the first picture, almost all of it downloading. Roughly 3 GB for the runtime and 9 GB for the starter models. Nothing is installed system-wide, and everything lives in one folder you can delete.
Model sizes are shown before you commit to a download, and the app tells you which models this Mac can actually run before you spend the disk.
Apple Silicon only, and that is not an oversight. MLX has no other backend and the key handling is macOS Keychain code, so an Intel or Linux build is not a missing target but an impossible one.