but this behaviour leaks into other areas of my life
Speaking only for myself, it leaked into ALL of the rest of my life. The most critical was into my professional life.
And? I found that a lot of the AlAnon tools and help was very useful in many areas of life outside of the family dynamics - poopy clients for one. I now get to field all the poopy client calls because everyone where I work agrees that "you handle it so much better than the rest of us do." Go me? But it shows that learning how to set boundaries, how to detach without aggression, how to stay centered on oneself - those are skills that are highly useful *everywhere*, even as they're particularly useful in your family.