Optimizing URL Structure in Relume: Seeking Better Solutions

I'm currently rebuilding a site with Relume from scratch. Everything is pretty neat so far but there is one thing I'm not sure how to resolve. I have a solution but I'm interested if there's any better one. So the original site made without client first and it's CMS is not well thought through. The startup can't allow to mess up SEO right now so I have to keep all the slugs. The original slug structure is directly nested under the domain. So the site is www.example.com/pagename. But in the new site I'd prefer to generate new pages from CMS but that's only possible with this slug structure: www.example.com/page/pagename I can obviously create new pages manually and attach their links under the CMS nav elements. But that's slightly less convenient. Is there a better solution?