Have you actually ever made anything on a "smooth plate? The surface is smooth as you say, but lines with will show between the printing passes and its actually way less attractive than the textured surface. The textured plate isn't operator error or sloppy, its deliberate to give a better...
Awesome you found a way to do this too! So I am currently modifying the stock part NL3Z-8A224-AA , and adding provisions to ziptie it to the grille. If anyone is interested, you can get one here
https://micallefinspirations.etsy.com/listing/1604208899