Archived products for OpenCart 2

There are a lot of goods in the store and some of them have lost their relevance (for example, discontinued - end of life). I don’t want to delete (hide) them, since it is possible that search "additional traffic" goes to it. In addition, there are characteristics, there are specifications inherent in the product. I would like archived goods to be available through a direct link, but they did not participate anywhere on the lists, including not getting on the site map. This is implemented by many manufacturers and large trading floors.