i’m not sure how this could really work. good therapy requires the person of the therapist, and it additionally takes place within the context of a client’s living. are there therapists willing to give up subjective years over and over and over? how does the client try new things, gain understanding without the feedback of their life between sessions? also - therapists seek information and process their work with clients between sessions.
on top of all this, i’m not yet convinced this would be psychologically healthy for either.