Unfortunately, no one can be told what Redcore Linux is. You have to see it for yourself!
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I can package i3 and related things as binary if you wish, but honestly, spinning ISO images is time consuming. It takes 3 hours just to spin, which then needs to be tested if it boots, if it installs, if it crashes and so on. If somebody else is willing to spin any community edition, I'm willing to package the required stuff. But I cannot maintain multiple ISO images myself.
sisyphus install cinnamon --ebuild
These are the binary packages that would be merged, in order:
dev-python/webencodings-0.5.1-r1 dev-python/pyproject2setuppy-20 virtual/freedesktop-icon-theme-0-r4 media-gfx/potrace-1.16 media-gfx/imagemagick-7.1.0.13
Total: 5 binary package(s)
These are the source packages that would be merged, in order:
acct-group/colord-0 sys-auth/nss-myhostname-0.3-r1 dev-python/setproctitle-1.2.2 gnome-extra/cinnamon-translations-5.0.2 dev-libs/libtimezonemap-0.4.6-r1 dev-python/pyinotify-0.9.6 dev-python/pypam-0.5.0-r6 media-libs/exempi-2.4.5-r1 acct-user/colord-0 dev-python/ptyprocess-0.7.0 gnome-extra/cinnamon-desktop-5.0.0 x11-libs/libxklavier-5.4 gnome-extra/cinnamon-menus-5.0.0 x11-libs/startup-notification-0.12-r1 gnome-extra/cjs-5.0.1 dev-libs/keybinder-0.3.2-r300 dev-python/pexpect-4.8.0-r2 dev-python/tinycss2-1.1.0 gnome-extra/polkit-gnome-0.105-r2 gnome-base/gvfs-1.48.1-r1 dev-libs/libgusb-0.3.7 app-admin/openrc-settingsd-1.1.0 net-libs/libnma-1.8.32 dev-libs/libgee-0.20.4 dev-python/pyatspi-2.38.1 media-libs/cogl-1.22.8-r1 gnome-base/libgnomekbd-3.26.1 x11-misc/colord-1.4.5-r1 x11-wm/muffin-5.0.2 gnome-extra/nm-applet-1.22.0-r1 media-libs/clutter-1.26.4 virtual/imagemagick-tools-0 x11-libs/xapps-2.2.4 app-accessibility/caribou-0.4.21-r4 gnome-extra/cinnamon-settings-daemon-5.0.4 gnome-extra/libgsf-1.14.47 gnome-extra/gnome-color-manager-3.36.0 dev-python/xapp-2.2.1 gnome-extra/cinnamon-control-center-5.0.2 gnome-extra/cinnamon-session-5.0.1 gnome-extra/nemo-5.0.4 gnome-extra/cinnamon-screensaver-5.0.7 gnome-extra/cinnamon-5.0.6
Total: 43 source package(s)
Would you like to proceed? [y/N] n
Ok; Quitting.
This will install Cinnamon alongside KDE Plasma. Be aware that source packages will be compiled locally on your machine, so it may take a while.