While I admit that the following is possibly a _terrible_ solution to the problem I will note it for the record.
One could run Xnest an put the WM (Unity) in that, keeping onboard and the Xnest window in the primary X window.
This feels like an ugly, nasty and generally evil hack which is going to have all sorts of unforeseen effects but, there you go. Flame away!
While I admit that the following is possibly a _terrible_ solution to the problem I will note it for the record.
One could run Xnest an put the WM (Unity) in that, keeping onboard and the Xnest window in the primary X window.
This feels like an ugly, nasty and generally evil hack which is going to have all sorts of unforeseen effects but, there you go. Flame away!