I havn't done this, but,
you could try to turn off the BIND node (disable) it in the attribute editor. Try selecting the bind node and scroll down to the node state and try temporarily turning off the skin node while doing this operation.
eg. has no effect, blocking, etc...
also check the order of your binding blendshape nodes on your mesh as changing the order may be another workaround.
Mayan elder......only in years.....