Several new lightweight LMS systems for WP are hittign the market. One is from the FluentCRM folks called CluentCommunities. The other is fro mthe SureCart falks that’s called SureDash. Being lightweight they both could beenft from some of your features integratedvia embed and API:
Virtual Classroom
Meeting Rooms / Webinars
DRM Storage
Courses / Couse Player
SCORM
Content Sales Store
Contacts:
https://community.wpmanageninja.com/
https://www.facebook.com/groups/298572782389153