I was thinking about a tattoo gun. Instead of the super sharp need, grind the point off so it's like the full 1/8" diameter.
Which reminds me, I did try an engraving tool, the kind where you would scribe your initials into your wrenches.
Somebody on another forum mentioned a tobacco pipe company has that kind of texture on their pipes. He said it was done with a sandblaster using steel shot.
I don't have the money for yet another larger air compressor to hook up to a sand blasting cabinet.
There is a tool called a "needle scaler" that is used for like cleaning the slag off welds:

There are some hammer drills that you can flip a switch that makes just in hammer mode.
Thanks for all the replies.