Oh well, since nobody's answering and for the sake of boosting my post count:
Any competent neighbourhood garage can change a brakeline, rigid or flexible. There's nothing magic about (non-competition) E30 brake lines.
Pick one close to you with the right amount of dirt on the floor and the right vintage of posters on the wall.
Don't go to a franchise place with carpeting; go to a place with a flaring tool, a roll of steel brake line on the wall and a couple of old guys near the counter.