I'd say psychoanalysis is infeasible simply due to the amount of time required. I cannot say what hypnosis would add.
Depending on what you mean by "insights" you could use standardized psychological assessments. If none of them meet your needs, you could do a few interviews and then turn the most interesting or important issues into questions for your own survey.
Please read Anima Est in what comes to hypnosis. Perhaps my blog with Blogger, the one on Curiosities, should also be of help, since I there mention real-life examples of oddities involving hypnosis.