After consulting multiple professional reverse engineering people, because of money I will have to figure out for myself the painstaking process of recreating the scan data of the head into something usable for a foundry to cast. Will update in a year or so when the model is complete, haha.
If you need help with the 3D modeling process, I can give you a hand! I'd love to see this become a real part in the near future, so lemme know if you need more hands to make less work.