Merge Pose Morph tags?

Hello! I'm currently working on a small rigging/animation project and I have a question about pose morph tags. For some reason I decided to do eye poses and mouth poses using two different tags (on the same mesh). This causes problems when animating the two different sets as verts will snap back to the 'base pose' of the eye set when moved. Is it possible to merge the two sets together? I've already tried copying to no avail, and it would be nice to not have to redo the poses / export head meshes and create poses from that.

Cheers!