I've created a custom route for each nodes, let's say /custom-page/{node}, which renders some specific stuff from a Controller.  

On this custom page, I'd like to automatically display the same local tasks as displayed on nodes canonical pages (In my case : View, Edit, Delete, Devel)

I know I can set dynamic local tasks using a Deriver in links.task.yml but how can I load local tasks from another route ?  

Or maybe there is a way to tell Drupal to display local tasks as if it was for the route "entity.node.canonical" ?

Thank you for your help !