I make instruments that are sometimes unorthodox and it serves helpful to mark the notes that each part of the instrument creates for ease of use. This is often done using metal punches.
The issue with this is marking chromatic instruments or instruments that aren't in C major - finding a metal punch for the pound symbol may be close enough, but the italic lowercase beta is likely going to need to be custom ordered.
Are there other notations for flat/sharp notes that are easier to "draw" than the ones commonly used in western scores?