I have several lip bones, as shown. They are not linked to each other in a chain, but share a parent and grandparent (maxilla and head).
Each non-corner lip bone is weighted generally like this along the length of the lip:
I would like to have more than 3 bones per lip between the lip-corner bones for finer control of the mouth polys (e.g. 4 or 6). Is it possible to subdivide parallel/sibling bones and redistribute weights between them? Alternatively, can someone point me to an effective way to rig lips (not Rigify plugin because I don't know how to export that)? Thanks!