Actually... you can probably do it with MOST pump impellors. A lot of Boston Reefers are experimenting with modifications to many pumps.
With a true impellor pump, like Maxijet, you would simply (and carefully) reduce the profile of the impellor blades. Cutting the height in half or to 1/4 for instance. Then you can attach the mesh to what remains using various methods. OR, you could make a disk of the same quality plastic and adhere the mesh to that, and that disk to what is left of the impellor. You may have to drill escape holes in it to let air through. I don't know, I've not tried.
In any case, with smaller, cheaper pumps, the cost of an "oopsie" is minimal. Why not try 
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
