That would be a solid no. There is no Always on top hotkey in my WM (XFCE was a long long time ago before GTK broke XScreen enumeration). That said if I had hit some always on top toggle, pressing it again would remove it and as I've said, nothing will remove it. I've tried every tool I could find that can manipulate windows and when this happens as the OP says -NOTHING- will remove the _NET_WM_STATE_ABOVE state.