I would try to figure out exactly what it is that you don't feel comfortable with when it comes to back squats though. Some very strong guys/gals think Zerchers are amazing, and some think they are worthless. I like them, myself.

If you have the shoulder ROM to do Front Squats I would give them a shot and if you don't have oly shoes you can put your heels on 2.5 or 5 pound plates which will help keep your torso upright.