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I assumed phonemes weren't simply about the lips, but also the tongue.

I dunno. There are people who lip read. Maybe they'd be the best to ask about the differences. :)

I'm sure lip readers would pay more attention to the tongue and might see the difference. Most people who don't read lips won't.

At any rate, what does the tongue do? In-out and up-down. So you can add two more morphs to the three I've mentioned, and maybe a "lower lip in" for the F if you're really fussy, and that should combine to give you all your phonemes. But: all of those will be general purpose morphs. You can reuse them for any expression you like.

-- I'm not mad at you, just Westphalian.