Apple won't let me provide information to solve this problem (saying it's "off topic"). I think it's perfectly relevant because it gets round the technical limitation of not being able to change the font to something that everybody can recognize.
The way round it is (for the human) to learn to recognize the new font. And this is what I'm suggesting you do in the meantime.
I have a handout that I can send you that shows the relationship between the modern font and the standard "classic" font. Contact me via my profile and I'll send you a copy. Only a few letters look very different from their classic version; and these are the ones that you need to focus on.
Some basics that might help in the meantime.
- Modern fonts mimic "lazy" handwriting.
- Thai letters are written starting from the initial loop.
- So when you write fast, the initial loops tend to get left out – or they become strokes or blobs rather than actual loops – kind of what happens in our script in cursive handwriting.
- This affects some letters when written lazily, particularly:
- The ร starts from the bottom, so if you write it fast and don’t bother with the loop, it almost looks like our “S”. It helps to think of a snake, rearing its head as it’s about to strike.
- The ว also starts from the bottom, and when written fast and lazily looks a bit like our “C” written backwards. Think of a cartoon face with a wiggly ear on the right.
- The backwards "G" is actually the อ written quickly or stylistically. Very often, you will see it simply as an "O".
- Finally, the "U" is simply the U-boat บ and the upside down "U" is the chicken without its beak ก.)
Basically, the modern stylized fonts are the minimalist versions of the classic letters: everything that is unnecessary is eliminated and all that's left are the bits that identify the letter uniquely.