Not sure how that will end up looking but either way i should think a few miles and stones bouncing off it will quickly ruin it whether it looks good or not.
Personally, i'd want it kept unpainted...... Its around £100 for a US Spec grill which is smooth instead of the plate mountings, then do the magnet mod thats in the How to section and it'll look 10x better....... I'd try reach a compromise to get it replaced TBH