Duplicate and mirror shape keys?

Can I effectively duplicate and mirror a shape key?
Is there some sort of quick workflow for telling a shapekey effecting both sides of the face to split into two shape keys for either side?
Here is a picture of the model’s head, it should be symmetrical.


Please, any help/ideas will be greatly appreciated!

Also, can I get two shape keys to inversely effect each other via drivers?

Can I effectively duplicate and mirror a shape key?
Enable the shapekey you want to copy.
Use the ‘New Shape from Mix’ option to duplicate the shapekey
Then use the ‘Mirror Shape key’ option to mirror this one you just created

You’re a lifesaver!

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