embed Storyline modules in wordpress?

Hi all, my client wants to have paid and free user logins to their course along with page tracking, score keeping and leaderboards for games, etc.

An LMS will not work (we looked at Moodle) becuase we don't want the LMS itself to show (clunky looking boring layout with TOC page) as this course is for kids. And from my understanding, you can't do full screen storyline modules. Right now it is hosted on the web and it's full screen. The menu systems are all branded and designed so we do not want to use the LMS' menus or TOC. 

So for the user logins and paid memberships, I thought of Wordpress since their main site already uses it and I know it can have different types of users.

Any suggestions as to which storyline plugins we can use that allow progress/page tracking, different types of users, full screen modules, and able to navigate from module directly to another module such as a Menu module to whichever module they chose and back?

This is the site as it is now: Pip's Town