A quick, slightly dull update regarding my phonetic alphabet.
It occurred to me that the [i] sound, as in the word eye, is really just a combination of an [a] and an [ee] sound. It starts with the [a] then transitions, and ends with the [ee].
I really don't know how I missed that one. It means I can remove the capitalised [i] sound from my list of letters though. So now we just have nine vowels.
Leaving it all looking something like this..