Keyboard

OK, I'm doing it, but there's a little difficulty I found. In this keyboard, the ​ေ (on the 'a' key) is typed before the letter, so to get ကေ you type "au". Implementing this is possible, but considerably difficult. Is it OK if it's typed after the letter, so that to get ကေ you type "ua"?

I made several keyboards, and I know some things about some Brahmic scripts, but I know almost nothing about the Burmese script, so it's actually possible that I'm missing some more details.

The ကေ typing method is (Key Burmese=ua u+က a+ေ =က + ေ Mon=au a+​ေ က+u ​ေ+က), (Unicode code=က=က ေ=ေ), are there any other requirements?, ask me if you have any further questions, thanks.