The only user of this shortcut is DigiKam, and they are amenable to changing it: https://bugs.kde.org/show_bug.cgi?id=386335
Tested in KDE Neon. Tried out Plasma, KWin, Dolphin, Kate, Konsole, Gwenview, Okular, Konversation, KTorrent, and Skanlite; all now have a consistent keyboard shortcut for their "Configure <Program>" menu items.