I looked into it no long after I noticed the fire ring was split, but there was some reason it wasn't possible. I either didn't have something (i.e. proof of purchase) or the time frame had been too long. I honestly don't remember. It wasn't causing me any issues so I moved on to bigger and better things, I guess. Lol.
The fire ring can be replaced at any BGE dealer for around a hundred bucks. Even with the split ring, this is still a good deal for everything included.