Initially I just wanted to fix blur behind the greeter on wayland and then figured I might as well split it out to reduce the likelihood of ksmserver crashing due to opengl/graphics stuff
"Switch User" in kickoff, binary launched and showed the greeter, cancelling it or clicking in empty area would quit the greeter. Switching a session also worked. The window also has blur now.
The panels show up ontop of the window on Wayland but that's also the case for the logout greeter.