Well, there are plugins, and actually I had been attempting to go this route myself.
I'm twice yer age.
I believe what you are looking for is the "green box" radio intercom plugin. I can sorta make myself sound like a number of different characters including HK units. I'd be glad to help any way I could.
I can also imitate sidious and malgus. Maybe Sion if I could just get the accent right.