View that uses both taxonomy terms and title(or nid) in contextual filters
I wasn't able to find a neat solution to this problem.

What I ended up doing was manually creating a page view from each taxonomy e.g. metals/gold/% and passed it the node title through contextual filters. This meant I was able to create a view of the correct product and the Easy Breadcrumb trail still looked good and a single product may exist in multiple breadcrumb trails. This works but isn't an elegant solution.

It would be great to find a solution to this that didn't need manual creation of page views. So any further thoughts on this are appreciated.