Having two different versions of the same post?

I’m currently working on a site that’s targeted for beginners in a new language. Now I’m looking for something that can ease my work with having two different versions of the same post. One “easy to read” and one with more adept language.

In the front end there should be some sort of option that let the user tab to which ever version he or she would want to read. Would be good if the user could set a default value in the user profile aswell.

Anything ring a bell?
I figure WPML would be worth a shot, but I haven’t used it before, and I would like to try and find something else, since WPML also seems a little bit to advance for this purpose.

I think that having two separate posts for the easy/adept versions is going to be hard to manage consistently, especially if you end up with alot of content.

It would be easier to use custom fields to store the two sets of information within the one ‘post’, then use javascript to toggle between which one is visible on the frontend.