Grower of people, plants, performance and profits. Advisor, trainer and designer for businesses focused on making a difference in today's world.
Have you considered using OpenCourseWare to address the gaps (Coursera, EdX, Udacity, etc)? I've had large global organizations move from SkillSoft to OpenCourseWare to fill their curricula.
The bigger question is: Why doesn't your organization provide the generic/101 training for the topics in which you provide advanced training?
Given your desire for channel partners for revenue growth, it sounds like you have greater needs than just content. If marketing is a challenge - define your audience and start with benchmarking competitors. Alexa's competitive anlayses helps refine audiences, topics and more so that you can know where your organization is best able to compete, win and avoid.
Start there - if you want to continue a conversation with followup questions, call me.