If I was younger and knew then what I know now and had the money I would do everything except, for now, change my plumbing, and I'll tell you why.
If you have a part of your body removed, like a leg or arm, there is a pain called "Phantom Pain". I'm afraid I would have this pain if my plumbing was removed.
Maybe after all the changes were made I would think of this last task a little more in depth.
I don't want to seem rude or crude but a doctor once said it was easier to make a hole than make a pole.