"Page manager existing pages allows you to override/configure Drupal menu paths so you can create variants with Page manager, which is bundled in the CTools project.
Technically, this project defines one abstract task and one content type plugin, so menu items can be overridden and the original page callback can be called through the content type plugin. This project comes with one default existing page, which is 'node', the default Drupal frontpage.
Tested overridden paths
Drupal frontpage at 'node'.
Media file paths as 'media/%'.
Apache Solr search pages at any path you defined.
FAQ at 'faq-page', 'faq-page/%', 'faq-page/list' and 'faq-page/%/list'.
In theory, any menu callback can now be overridden. Default contexts can be added for entity paths, but will need more testing."