Prepare a bootable USB drive with PureDarwin and create a new partition without disturbing existing macOS installation.
Install PureDarwin on the new partition, set up network connectivity, update the system, and install essential development tools.
Install X11 window system, KDE Plasma desktop, display manager, and configure X11 to start KDE Plasma.
Configure the boot manager to choose between macOS and PureDarwin during startup, customize KDE for a Linux-like experience, and install additional software.