For your True Star Wars conversion, would you use these roles as is? I ask because the PCs have some much higher damage potential. Not sure if this will skew your calculations, specifically for the critters toughness.
I probably would, if I didn't already go to the trouble of statting something up.
The higher damage means that, like the players, my villains will have to be more intelligent about how they fight. Grab cover, use the Defensive Stance action, etc. to minimize the chances of having to make a Toughness save.
Plus, there are two standard features that can vastly increase character survivability. The first is getting to use a damage track. The second is getting Conviction. The combination of those should let anyone survive the first couple of shots. I make no promises for after that point.