Stencil

[Leviset]

Does anyone know where I might find/buy a stencil (plastic or steel) that has Mathematical Symbols e.g. with things like Greek Math Letters and often used symbols like ⋐⋉⋸⩰Ωδ∜∫∀ please?
I’ve found lots of EE symbols and one with Greek Letters but can’t find a dedicated Math stencil.
I have an old plastic Standardgraph plastic stencil ruler with upper and lower case letters - I’m looking for something similar but with the symbols mentioned above.
The reason and why I can’t use a paper printout as a guide is that I’m trying to engrave math symbols on to a curved steel surface with an electric engraving tool.