Happy to find your suggestion for improvement. Before I found PIE, I envisioned using extra small numerals plus some easily distinguishable extra small caps and other special characters in the descender space beneath the baseline to give the non-default sound of the letter or associated diphthong. Arrow symbols would join other letters in the diphthong. Centered dot for silent letters. Vertical bars, full, partial, and broken, would indicate syllable boundaries and accent. The advantage over PIE would be the use of familiar symbols with established sort orders for lookup help tables, and the keeping of symbols in one space below the baseline. Could be implemented through a transformation of PIE logic and special font development. PIE looks good to me and I encourage friends to use it.
Would appreciate feedback. My younger ESL friends often need encouragement.
I do not know that spelling reform is the full answer. Text to speech software can provide the true sound of text in context as would be spoken by a highly literate or highly intelligible speaker. Such sound could be coded below the text for presentation to those who desire it. The familiar printed form would be kept throughout. Spelling reform is a somewhat different issue than the issue of connecting for those who desire it the written and the spoken language.