I think this is the worst Operative buff idea I've read, I'm sorry. I don't want to be mean.
Look, the problem with Operatives is that people HATE getting hit by them from stealth when there is almost no chance to fight back before 75% of your hp vanishes. And Operatives HATE how long it takes to restealth to do it all over again, since they have poor sustained damage in the meantime.
Your suggestion relies on the very thing that Operatives are complaining about - getting back into stealth - and buffs the very thing that other classes are complaining about - Operatives having too large of an advantage when they jump you from stealth which you couldn't prevent.
What is actually needed is for Operatives to be able to stealth more easily but do less burst from stealth, and have a little more sustained damage.
A burst from stealth is fine but remove the stun effect add an easier way for the OP to stealth, slight buff to energy management. Done.