I'm not quite sure if that works. Thing is that when logging in it checks to see if the volume is write or read only. When it is write it sets it as a writable and the filterdriver does some things you can't change.
You could off course give it a try and after you set it,. just log off, attach the writable to a machine that has no Appvolumes agent, mount it and check to see what is actually written into the writable volume.