No. I need the functionality of a full desktop environment.
And KDE’s workspace overview is awesome. One keypress and I see all open windows, all workspaces and a global search field that switches to a program when it already has an open window and opens a new window if not.
And a tiling WM on top of KDE would be pointless to me since the behavior of a tiling WM can be configured through the GUI in KDE without installing anything extra.