How about using change of setting to effect a change in character? Can that work? Of course it can as long as the change in both place and character are credible within the plot outline or story and the inner psychology of the character affected. Some research may be involved here.

Most important in this particular device is deciding what event could plausibly unhinge our character enough to create an atmosphere where character change is not just desirable but necessary. This can feasibly be done by moving our character to a new environment or changing, significantly, the one in which he now lives.