Can you just shoot
new paint on these areas after sanding down and blend
in?

Yes, but any wet sanding at the edges runs the chance of going thin
and showing primer through. Not that hard to shoot the tops only with
enough paint to allow a complete sanding and buff-out. I did this on
my Genesis after the re-build, most areas were just scraped up, so I
filled and painted without primer in most areas.........came out good.
JJ