Hmmm...

For the maatras etc, I'd have thought a function or control key would be the best idea for the vowels, instead of trying to create an entire syllabary of every combination mof vowel and consonant. Ideally (but I haven't seen how these things works), you ought to need about 45 main characters, 25 or so extra conjunction signs (mainly vowels, but also nasals and r) and a few specialist signs. 200 seems a bit excessive. Could you tell me what the 200 or symbols you need are?

cheer

the sunshine warrior