MMMMMagic 2.0

Make a backup of your save file before you get to Thamasa and cross your fingers. When I was first fiddling with Grayshadow's patch I made a lot of mistakes with Strago, which would result in a crash right outside the burning house (when his character profile is created). I've also had some of my hex tweaks completely hose a save file, though never with the spell learning (since no push-pulls were involved).

Alternatively, you might be able to make quick-tests by changing the start event to load Relm or Kappa instead of Terra and launching a new game. Granted that only covers the learning to level 3 (level 4 if you do a few fights), but it'll let you know if my code is workable or not.

That Terra and Celes work is promising, though, because it at least demonstrates that the checks in the freespace are correctly passing over actors 08 and 0f.