Coincidence that its open to the book of Exodus ?? oh man that’s pretty good never noticed that! Lol
To get back on point - I had an uncle who made a marker stone with family name for their front yard. He went to a monument company and had a stencil made. It was a plastic rubber with just the letters you want Etched in the stone cut out . You lay the stencil on the stone and hit it with a sandblaster and some type of aggravate Until you get the desired depth to the letters...It turned out very well. I don’t know what he paid for the stencil and you would have to have a sandblaster and air compressors... your way is definitely a lot more simple and low tech .I like that -now I’m half tempted to try it.