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I do not know anything about 3D printing, let me know if another place might be more appropriate for this post.
My friend about three months ago was in a catastrophic motorcycle accident. He was hit by a texting F150 truck driver. He lost his leg, an eye and has had pretty much full body reconstruction, including jaw and face. He was wondering if he could 3D scan in the helmet he was wearing with all the first responders/doctors (who helped save him that night) signatures then give each one a copy to thank them. He is in Ontario/Brampton area. He can pay for it.
Picture is not of actual helmet. Being sent down from up north right now.
It's definitely possible. Depending on the budget, you can take the helmet to a professional that does 3D fabrication.
I'd say the first step should be to find a local maker space and see if anyone there can help you. Most will have 3d printers, and some might have 3d scanners. If they don't, maybe someone there personally owns one.