There is no substitute, you only go power snatches if you can't physically rack the bar due to long fore arms. If your gym lets you deadlift, then they should let you power clean. Find another gym or do try to discretely do them while nobody is looking. People in fitness settings do dumbell cleans all the time. If they have a barbell in that gym, then they should expect people to make noise with it. Texas Method is an intermediate program. Its not meant for novice lifters. Starting Strength really is the best thing for someone starting off.