Sorry @sahsanu, but I am inclined to agree with @rg305 and @Osiris here. After setting up an unsecure, working nginx configuration, Martin should be in the same situation as any new certbot user when it comes to acquiring and installing a certificate. Without the certificates, I see the situation as basically a "start over fresh" scenario.
Now, if Martin needs the basic configuration files for nginx, he could download those. I feel like he'd probably be better off just creating a new instance then either copying its configuration or using it entirely.