Are there enough words that use the dipthongs to fill out the system? In my table above, two of the “vowels” are actually dipthongs (5 and 8). It looks like in Farsi there are some dipthongs (used in these words), but I’m not sure:
- چای
- سیل
- هوی
- روی
- موز
Another idea is to use a 3-consonant system (no vowels) and the Shadow System for cards, which is used by some of the fastest card memorizers.