Is there a way I can turn bone into metal?

I am playing a campaign that starts us off as commoners who have no adventuring experience. My character is a town drunk who has never gotten into a fight in his life. In our second session our party killed a homebrewed half mastiff half hellhound. The dog was large and so I want to try and have its head crafted into a shield but bone is a fragile material and it reduces the armor bonus by 1.

My goal is to craft it into a light shield and use it with 2 weapon fighting and improved shield bash and so on.

Is there any way to do that?