No, if production goes down then there’s no way to serve the site, since it’s a multisite, and a multisite is still a single install of WordPress.
It’s possible that code in the theme may bring down a site inside a multisite without bringing down the entire thing, but any DR site will be running the same code.
Instead, for DR, you will want something on a different server, ideally a different data centre, but that’s a subject for a different stack, and out of scope on WordPress SE