Neat project. Too bad it only handles English phonemes, as it would be very valuable for teaching other languages. Maybe someday I'll convert it from ARPABET to IPA...

Neat!

Jerry Pournelle often mentioned having an application which would teach reading --- apparently it is now out of print?

https://www.readingtlc.com/

Have you looked at intermediary things such as the "Living Books"?

https://wanderfulstorybooks.com/