"Unsane" was Korzybski's word a long time ago. One blogger in the general-semantics tradition writes: "The difference between unsane and insane is that unsane doesn't necessarily get you into trouble." G.s. uses "unsanity" to mean something like "having a map that doesn't describe the territory accurately."
That said, I think we should recognize that "sanity" is the name of a social, behavioral concept, too. We should be cautious using it, since it may drag in those connotations. A person who can't cope with the world due to psychological difficulties may be labeled "insane" by society even if their map of the world is not any more inaccurate than anyone else's. Once upon a time, being sexually attracted to people of the same sex was considered a matter of insanity; today, being an impulsive child who won't sit still in classrooms is considered a matter of insanity.
Edit :Excellent suggestions in the comments. Two of them stood out for me:
We often use "insane" to describe people whose behaviour or beliefs are below the sanity waterline. But as most must would agree here, you cannot call someone insane with a straight face just because he happens to believe in magic.
I'm currently watching Future by Design, a documentary featuring Jacque Fresco and the Venus Project. Jacque came up with this word, "unsane", to describe people who basically, aren't rational because they haven't been exposed to the right ideas yet. Which would be different from "insane", which is more about irrevocably irrational people.
I like this word, because there isn't the tone of accusation we find in "insane". This neutrality makes it easier to say that we can do something about it. Insanity should be eradicated like vermin. Unsanty on the other hand can be fixed.
So, do you think this word, "Unsanity" might be worth using?