When Khan tries to grab you, rewind him. When Khan ults you off the stage, use setback. You can even rewind him after he battle shouts to take away the heal. And with that, you've taken away Khan's best abilities.
From distance Jenos can't do much damage but he has cards that reveals enemies shot by him for a short duration. That's not all, at close range his Void Grip ability can grip even stealthed enemies
Focus on Inara last, aim for everyone else first. When needed, poison her and get a couple hits in, but make sure to move around so she has a hard time hitting you because her shooting time is slow.