You might like to try a search on 'visemes' (the visual counterpart of phonemes) before tackling this...
most vowels will have the same viseme (try saying 'a..e..i' and look at how much the mouth changes - very little until you try 'o' and 'u')
many sounds can use the same viseme - e.g. 'p' and 'b' both force the speaker to purse the lips...
You might also do some research on phonetically equivalent 'strings' - search for 'Soundex Coding' so that you can play the same series of lip motions for the string 'feenicks' and 'phoenix'
most vowels will have the same viseme (try saying 'a..e..i' and look at how much the mouth changes - very little until you try 'o' and 'u')
many sounds can use the same viseme - e.g. 'p' and 'b' both force the speaker to purse the lips...
You might also do some research on phonetically equivalent 'strings' - search for 'Soundex Coding' so that you can play the same series of lip motions for the string 'feenicks' and 'phoenix'