[xmonad] Flip workspaces using a multihead display

[Ones Self]

Hi,

I use two monitors on my machine.  I often find that I'd like to
switch the workspace on the right with the one on the left, and
the left with the right. This currently takes two key strokes which
change depending on which side I happen to be focused on,
and which workspaces I'm currently viewing.  Which is annoying.

Can I add a single key stroke to achieve this?

Thanks,

-- 
"I know you think you understand what you thought I said but I'm not
 sure you realize that what you heard is not what I meant"
                                                   -- Alan Greenspan