I hacked a version together, that works for me.
It involves an applescript and a python script.
Feel free to check it out
here
I'd be happy about feedback -- and thanks for the help on this forum!
One thing: is there a more omni-like-way of calling scripts in omnioutliner (and not via quicksilver)? -- I remember that there used to be a toolbar icon for applescripts, but I can't seem to find this option anymore.