I am not sure if this will help you, but I have done a create shapes manually inside my animation comp and set all paths to trace off the path on index 1. this let me click create paths and send layer to the top of comp and have it update everywhere. Then if I did a couple times, I could even hot switch the linking to the top most traced mask, on the topmost layer just by moving to the top.
thisComp.layer(1).mask(1).maskPath