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Would you realize the same boundary layer buildup and spillage if you just covered the grill in window screen?
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nope, i don't think so...I had the same idea once, but it seems like any mesh will just block the grill with the equivalent of the surface area of the wires, the only effect i could find in literature on the web, was that a mesh tends to smoothen the flow... the airflow will not go turbulent for some distance after the mesh...
perhaps this effect could be beneficial in certain setups, but a mech or screen does not seem to be the magic key...
i've eperimented with the screen , but didn't experiment further after reading info that sugested it wouldn't work, and no real world indications of any "block" effect could be found in my FE results