Decal wrapping without blender

So I modeled this german helmet in blender and if I were to use a shrinkwrap modifier it would be too many triangles, also if I tried to use a decimate moidifer it would look really bad by the time I reached below 10,000 triangles. Does anybody know a way to do this in Roblox studio, keep in mind I am not good at texturing.
Picture from studio:

Image I’m trying to wrap on the side:

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Duplicate the mesh, delete everything but this little patch of geo “blue square” offset it slightly. Make it fully transparent and put the decal on that.
image

How would I delete only part of a mesh

You would need a 3D modeling program. Which you would select the faces you want to delete and re-export

What, if you put the decal on a roblox sphere meshpart (or just a ball made union) and squished it to align to the helmets curvature (and made it transparent, can’t collide etc.)?