Is it possible to show tags in place of subcategories?

There are certain topics in our community, where we require a topic to be shown in 2-3 different categories, making it impossible with categories. It is possible with tags, and if at all to get rid of categories, there are few challenges too. Example, we can’t name and colour a tag like category, no option to show them in home page (as shown in the below image).

In the highlighted portion below, I would like to show some selected tags. Is that possible?

It isn’t, but if you’re looking to sort and filter topics by tag have you looked at the knowledge explorer plugin?