Anyone using eductors on return pumps?

[Myka]

I'm back to working on my 100-gallon 48x20x24" tank. It was built for me a few years ago, and I honestly can't remember why I got two return holes drilled... I have an OM 2-way that's been sitting in a closet for several years and figure maybe I should hook this up to my return pump for more flow options. The return is a Poseidon PS3 with about 660 gph at 5' head pressure not considering plumbing. Obviously, this won't be very significant because the return pump isn't very big, and I don't want more flow through the sump. Seeing as this pump is pressure rated, I had the sudden thought today that maybe I should add a couple eductors to the returns.

This should make it so that there is about 1800 gph flowing out the eductors and switching back and forth from the right return to the left via the OM without increasing flow through the sump. I've never used eductors, so this is uncharted territory for me. Has anyone tried something similar to this? Is it worth the effort and complication of plumbing or should I just toss the towel and plug that extra return hole? I'm not willing to go through the headache of all this extra plumbing if there would be no benefit. I'm a bit worried the powerful powerheads (two 6105 and one 6055) I have might just wash away that 1800 gph and make it a moot point. I would not be impressed.