Drush on production server without Composer I want Drush 9 on a Drupal 8 production server without having to install Composer. Is there any way to do this?

And if that is not possible, can anyone suggest an alternative to Drush especially for maintenance, updating and syncing the site with dev and staging?
If you don't want composer in production on your server, you can run the composer commands locally to install Drush, then make sure to push the vendordirectory to the server. Make sure to also commit the composer.json and composer.lock files, so that anyone else working with the codebase can handle composer on their own local machines as well.

In this way you never need composer on the remote production server, but can get drush.