Maybe a carriage bolt or a bolt with a washer on the front and a wing nut on the back. You could paint the bolt head/washer black to match the grille block and the nut will be out of view. That is, assuming you can reach the rear of the grille.
Velcro sounds like a good idea. You could put velcro straps around the grille slats and have a piece of velcro on the block. Easy peasy.
Otherwise, maybe magnets of some kind? I don't imagine the block will want to slide around a ton anyway, but some decent magnets might hold it reasonably well.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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