link proxy and shapekey


an issue was raised in the anysculp thread about using corrective shapekey in animation with shared material.

I’m currently working on an animation with other people usng dropbox as exange folder.
We separate our main character from each specific scene and use a link so that we can work on the animation and on texturing and adding feature tu the rig as the same time (that the normal usage of linked file)

But for our polishing animation it can be usefull to add corrective shapekey in our animation. But I can figure out how to put new shapekey with the kinked file.

do someone now a way to do that ?

many thanks in advance for your help.