This would be cute, except you'd have to catch the biases in a dreamscape/mindscape of some kind, not in the "wild". (Why would you want to retrieve them, even for shrinking, unless they were already inside your head?)
Because biases are so much easier to identify in other people, of course.
Hey rationality friends, I just made this FAQ for the credence calibration game. So if you have people you'd like to introduce to it --- for example, to get them used to thinking of belief strengths as probabilities --- now is a good time :)