Hello Skeletor,
I think I know what you're trying to do, I think the fuge siphon would work (and by the way a good idea) I think all you'd have to do is put a "y" in the return line that should automatically create a siphon. I don't know about having the feed and the return from the skimmer into the return line. You'd have to have one hell of a pump to drive the skimmer and have enough return to keep up with the drain. You could make the return of the skimmer a separate feed to the tank, this would give you another flow outlet in the tank. Also think about using your drain to your advantage, we have three drains on our tank that go into a sump in the cellar, I've T'd off of two of the drains to feed a fuge and a frag tank. Both of them then drain back into the sump. No pumps no power useage, this works very well for us.
click here to see our sump