I would probably look for a highly experienced therapist, 20+ years who does depth psychotherapy, who's been through therapy a long time themselves, who dealt with some of those issues in their own life, and give them what you just wrote here.

My therapist fits the bill you describe and she has those qualities. Also, look for someone who doesn't "specialize" in everything, but in a few things, including your concerns, so you don't get someone who tends to just deal with malaise or lighter stuff. It seems to me that those who deal with PTSD, especially due to early family trauma, and some of the other more serious mental disorders are better suited to dealing with that much emotion and the attachment that needs to happen if what you're looking for is a corrective/repairative experience (not a redo of course, but a revisiting to repair the early hurts.)

And I'd probably be sure and interview several to avoid settling too early.