Why not just draw each vizeme? You could make the “mouth” the bottom half of his head (there is no size limit) - then you can custom draw each other position. (I would try with crude mockups first to make sure it does work just in case.). You can also do cycle layers if you want better animation for the mouth movements (I have never bothered myself. I am not much of an artist!)
It is worth remembering that Character Animator (generally) does not care what the shapes of things are - it just moves images around. So you could attach ear twitches to an eye blink behavior if you want to. CH does not care if a mouth is shaped like a mouth or not.
(There are however issues that can come up, so its not _completely_ true - hence worth trying things out first.). With vizemes you get more mouth positions than just nutcracker jaw.
I would much rather have the nutcracker job. I like what you did but how do
you make it appear that it is opening by the side I don’t understand I only
have the option to do it position or counterclockwise or clockwise
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Here's what I did very quickly, so it looks pretty rough. I did a screen cap of your picture, added a +Jaw layer, and brought it into CH. This is the rigging -- you can see the new layer outlined in yellow. It has the same color as the original jaw, to cover up the teeth, with a small black line as the closed mouth. Then I tagged it as jaw, moved the origin as shown, set the behavior to rotate clockwise, and fiddled with the jaw strength.