Go into the project and move the "accidentals" sprite into your backpack. In the sprite, the shapes making up the accidentals are already grouped together to reduce struggle. You can use these sprites however you want in your projects. Press space to see more symbols
Drawn entirely in Scratch by me. It is best advised to use them with letter names, as the height of the "central sections" of each symbol are not very consistent and will look as such in staff notation. But, no one's stopping you from using it in staff notation. In the process of adding Erv Wilson's Linear Notation accidentals