It is of course entirely up to you how you wanna approach this, but I’d recommend using tenji (Japanese braille) instead:
Exactly my argument in my first post about braille… in fact, I already mentioned Japanese braille in that post last year…
The obvious advantage over your system is, of course, that it’s much easier to train since you can use the braille input on your phone to practice. Also, you’d be able to read braille when in Japan.