maybe you've done this already, but my first thought would be to make a preparser script that would take your likely voice inputs like "underscore foo bar" and

maybe you've done this already, but my first thought would be to make a preparser script that would take your likely voice inputs like "underscore foo bar" and translate to "_fooBar" which you would then pass on as input. i do something similar for a local TTS generator which often stumbles on certain words or weird characters