Just call them "natural highlights" and move on?

You could get a few highlights or lowlights put in, that'll cover them. Otherwise I can't think of anything long term. Another option is tinted brow gel, just be sure to avoid the stuff with fibers. Brow gel will wash & fade out every day.

Pull them out if there are only 15.

I feel your pain.
My hair is very dark brown naturally and the greys are white, sparkling and wiry. They are so noticeable and stand out like lightning rods.
I've just been plucking them out as I see them. However, it's becoming a big job.

Ask your stylist what she recommends.

You could try Gray Away if you don't want to color all your hair. I haven't used it but my mom uses it for her roots between salon visits and she seems to like it.

When I got too many gray hairs to pull, I started using demi-permanent color. (Clairol Natural Instincts)It lasts about 24 shampoos and is not hard on your hair as it contains no ammonia. The grays look like highlights. I did this for about 15 years and just recently started getting it permanently colored by a stylist.

There is a hair product for touch ups that is like eye make up. You brush it on to your hair and it washes out. No damage and no fuss.

tweeze them out,,,