I don't think you should paint the holes, just the 1mm around the PE grille part. Maybe painting it would also do away with that little withe edge around the decal you were talking about.
You'll only have to mask that edge, and brushpaint the sg black on, as the headlines are an easy border.
It's not a huge thing, but it is noticable (and besides, now you know I know everytime you look at it you'll notice too, I know i would
)
The only thing i could think of is if you didn't clear over the decals, and the tape would pull them off.