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your missing the point, that the grille has to look untouched, thus external blocks aren't allowed
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Then a grill block isn't really what you're looking for as that is the point of a grill block: to block the grill. Blocking behind the grill will likely give you an increase rate of engine heating which is a good thing, but that's a mechanical benefit and not so much an aerodynamic one.
To achieve the [external] aerodynamic benefit of a grill block and still have the grill visible, look into see-through materials like cheap plastic picture frames and whatnot that you can attach via zip ties or double sided tape.