I have a question: when I call these windows managers in a Xephyr windows *as root* there's no problem in opening other applications like the console terminal. But, if I call the window manager *as user* there are dbus problems for several apps. Do you see such a behavior too?
Also, when opening another window manager in a Xephyr window, I lose the ability of getting "blue" function keys like numbers, and that's quite unpractical. Unless there's a workaround, I'll stick to hildon.