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I very much like the idea of thinking of the I Ching as "a way to deal with the stress which results from excessive and unproductive thinking" and agree that an alternative of "embracing mystery" has a lot to be said for it in the educational realm as well.   Perhaps though it would be useful to parse "embracing mystery" a bit, since it is likely to mean different things to different people at different times.
"Embracing mystery" might be heard as accepting an in principle limitation to one's understanding.  While that might well serve for some people at some times as an antidote to stress, it also creates a distinction between things that can be inquired into and things that can't be.  I'd find such a distinction unpleasantly constraining in my own life, and would be disinclined to encourage it in a classroom.
"Embracing mystery" might alternatively be heard as accepting an in practice limitation to one's understanding at any given time.  This appeals to me more both in my own life and as a useful classroom recognition.  If we are ourselves evolving systems embedded in evolving systems, we must always act based on less than complete information, so there is no point in being stressed by having less than complete information.  Act when one needs to, based on whatever one's understanding is at the time, and be done with it. 
I suspect though that both "embracing mystery" and the I Ching are more than simply stress relievers that can help us get along with life.  Trees don't think, and so don't need the I Ching.  And we actually don't either unless we forget that we, like trees, have resources beyond thinking.  Our unconscious has lots of information in it that we don't know we have unless we stop thinking and act on it.  And so we might understand "embracing mystery" as embracing the unconscious.
One more step in parsing "embracing mystery" seems to me worth considering.  Acting is done not only for the present but for the future, not only to survive but to find out and contribute to what comes next.  In a deterministic universe, what comes next in some sense already exists.  There is actually no mystery, only what already will be but has not yet been seen.  In a non-deterministic unverse, one in which casting yarrows actually has causal significance, there are genuine mysteries: what the future will bring and what role we ourselves will play in it.   So one might understand "embracing mystery" as cherishing the opportunity to see what new things will happen and what our own contributions to that will be.   That too appeals to me both personally and as an educational contribution.