At Beginner Novice, I don't see much risk in trying your horse barefoot. One of three things is going to happen - 1.) your horse will adjust to being barefoot, stay sound, and compete safely 2.) your horse will not stay sound barefoot and you willl have to put shoes back on. You may lose a little time as the horse recovers from being footsore, but I'm guessing that's a risk you've already considered and are willing to take 3.) your horse will have trouble negotiating deep footing barefoot and after spending some time slipping and sliding, you'll decide to go back to shoes. Some risk here, but essentially the same risk as someone who stays in plain shoes until the horse starts slipping and sliding and then goes to studs.
So if you're interested enough to consider this, I just don't see an enormous downside to the experiment.
I will admit it's an option I have never considered, I usually went along a continium of barefoot to plain steel front only to shod all around to shod all around/rim shoes behind and then finally to studs as a horse progressed and was doing more demanding work.
However, I have had trail horses and school horses go barefoot if they had good feet and otherwise tolerated it well. So I don't see the harm in giving it a try.