You can also nest rootful Xwayland in there too!
From the user’s shell,
WAYLAND_DISPLAY=/run/user/1000/wayland-0 Xwayland :1 &
export DISPLAY=:1 WAYLAND_DISPLAY=
i3 &
xterm &
konsole &
Of course you that means you can also run Plasma X11 that way for example:
And the instance’s sidebar: