Bone grouping

hook.zip (69.7 KB)I think I have found that armature bones can be grouped together as long as they are connected in some way to another bone, but, I have several bones that are set on a path, connected by hooks, that are not connected to any other bone.
Is it possible to group these bones, say, 4 or 6 to a group, or are they going to have to be left on their own? I would like to group them to try to make the custom driver a little easier to design and manipulate. The .blend file is just a quicky to try to explain what I’m trying to do.
Thanks!