Ah, thanks for the correction. Do you happen to know if this is on KDE's roadmap for Wayland?

Edit: A little bit of internet later, I found these:

    https://drewdevault.com/2018/04/28/KDE-Sprint-retrospective.html
    https://userbase.kde.org/Tutorials/Using_Other_Window_Managers_with_Plasma#cite_note-1

It looks like it will probably be done at some point, and is definitely possible.