@karthost and others: If there is anything that ClassicPress can do to make this easier on hosts then we are definitely available to help with that.
Otherwise, the installation process for ClassicPress is not much different from installing WordPress, especially WordPress 4.9.x. Internally installing WordPress and then using our migration plugin would be another option, and we could add features like a WP-CLI command to make this easier, though again this would work best when starting with WP 4.9.x.
Until Softaculous / Installatron / cPanel support ClassicPress, the best option likely depends on the details of each hosting provider’s setup. And generally, software providers like to hear from their actual users about their needs. In this case: if you are a hosting provider, please write your installation software provider an email or support ticket and let them know that your users are asking for ClassicPress!