Building an email list is important. I find that a free course that contains something like a hotkey list and some free lectures usually motivate people to sign up to my school. In this way you build your email list.
I just don't know how you would do that with this platform as the user limit is rough. This should not be a problem on the more expensive options, but this is critical for a startup and a startup may not afford the expensive memberships.
I don't know how you would solve this with your user limits but I feel that this is important.
Thank you for posting your idea.
Have you checked the Share option that is available in the courses? Sharing a course, generates a public url that you can send to any user you want allowing him to access this free course without registering to your portal. So the users that visit the shared course, dont count to the total number of users allowed by your plan.
Do you.Have any.Healthcare first aid etc courses to try ?