I've been pondering the same question as you, if I were you this is what I'd do.
Remove the grill, and create whats essentially a large rectangular pipe/port out of fiberglass to put in its place. Paint it perhaps 25%gloss/75%matte.
A lot of work would be involved getting it just right (designing, molding, sanding, filling, painting and finishing the fiberglass), but the car would look really finished with a nice port style scoop leading up to your intercooler.
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