Interesting. This is a very detailed effort, with encyclopaedic ambitions across different languages. The question is if there is a lightweight version of this - someway of chosing a reasonably small set of phonemes which can represent, most English words accurately. The second part is to represent the phonemes by either using a small number of new letters and diacritics (which is what the IPA already does), or to map the phonemes directly to single letters or a string of two or three letters. With the second option, there would still be ambiguity in reading a spelling (where are the phoneme breaks?). But, the accent situation would improve and one can get used to the phoneme boundaries by looking it up for each new word.