Fell for the usual trap of teaching something complex. If you teach a simplified version, you just teach... the simplified version. You didn't teach the actual complex thing and the learners will eventually still have to learn that

I’m guessing it hasn’t been deemed noteworthy enough to add to Unicode alongside Shavian.

I posted this in Longreads and found out about it from the linked Guardian article. I had never heard of it previously

Interesting. I don't know that this particular solution seems great but English is a complete mess when it comes to knowing the pronunciation of a word from reading it alone for sure.