It certainly could be, especially if you’re not doing anything wrong. But if a government pries that much, you’d maybe be painting a target on your back by inventing a new language. You could also use an existing language that is hard to translate and learn, and isn’t well known. Like Ithkuil
Speakers aren’t overkill, but my god, put up some sound panels and bass traps. Resonance in that room has to be bananas.