GTK3 Labwc Mini Desktop and Manual Net-Installer:
Pacman and Archlinux mirrorlists pre-installed.
Install rpm distros that support zypper via zypper's --root switch.
Debootstrap available in TW's repos for Debian/Ubuntu.
Use arch-chroot from the package arch-install-scripts for easy chroot.
Man-pages left intact. RAMdisk by default. rd.live.ram=1 en_US

Inspired by: https://en.opensuse.org/openSUSE:Expert_Installation
"Basically any ISO that provides zypper will work."