We have done some studies on orientations to happiness of primary a, but never published it. I wasn't satisfied with the scale - I'm not sure it is appropriate for young people, especially the meaningful life items (which could be considered as eudaimonia). I an not aware of any other studies with children.

See my article about the arts, education and well being. I claim that first there is a change in discourse and negoation of the meanings involved. Gradually, the words turn to action and someday eudaimonia might be an important recognised part of education.