Really? Reeeeeally? Sure, you make that a requirement and the rest of your conditions are irrelevant. A full team of, well, anything on voice chat is going to stomp a bloody puddle in the chest of the team not using it. In any game you care to mention.
We already have it. Surely you've used "Smuggle" a time or three, right? What's your prognosis, doctor?
That would work, but you'd have to make it mara-stealth, not Op/scoundrel stealth. Then rebalance the rest of the class stats to not rely on it.