I've had great success with Supercheap Auto's version of Plastidip - "Dupli Colour Custom Wrap" on my Jimny's grill. Its been on for about 3 months and survived almost weekly pressure washes without bubbling up, still looks like the day I did it. I'm strongly considering getting a larger quantity to do the same thing you're planning. Its matte and rubberized, and if it does scratch, apparently you simply spray over it and it blends right in.

A bit pricey but it looks ace.