When I bought my last 535, the door panels were delaminating badly and I made templates of the leather inserts from the old ones and covered them with an alcantra-like material. I also covered the console shift surround and had some black sheepskin BMW Seat Vests. With black floormats, it looked very good to my eye and I never got any complaints. I think you are doing fine.

It is YOUR car after all and it is there for you to enjoy.