Vocal translator, but you can breathe with it.

[Kotlol]

As for mime, c'mon, really? You literally play mime not to talk. Zero people play monkeys to have to juggle with PDA beeps in vacuum.

I don't play a non deaf players so I can use the radio to report things, but when I play security and a deaf player joins security... I am forced to use the PDA to reach them. Now I am being punished for a player who chose not to have radio chatter....
Before you say.. but they can't hear you so what?

Well if they are my other only security in a small shift and I am being stunned, I can't PDA em, thus I can only send a radio chatter and hope anyone hears it before I am silenced...

Of course very situational.

Also I am 100% fine if I as a roach player may have to resort to vocal translators too. Though I wish i would spawn with one then cause I got the mutation from the start... but eh.. 
After all I chose this life. I am no hypocrit after all.

Eitherway... some design choices are there to inconvience and if you chose it.. you gotta live with it.