The thing is that the qdbus command only works from inside the terminal, because it needs to know the correct konsole instance. Anyway, I moved to alacritty because the konsole support for ANSI codes is terrible…
Qdbus command:
qdbus $KONSOLE_DBUS_SERVICE $KONSOLE_DBUS_SESSION runCommand "!!"
Great! Anyway, still far from what you can get with tmux or kitty with just a line in the config…