Question: Guitar knobs & numbers

My daughter likes her St Vincent, but she doesn’t like the lack of numbers. She can adjust by ear, but she likes to track what she uses. Even though there’s a ridge line on the top, it can be hard to see in some settings.

She likes the shape of the knobs. I can’t find anything close to that shape with numbers or marks.

So, any suggestions? Even minimal marks would be good. I don’t think the shoulder of the knobs are wide enough for using a rub off or wet slide decal.