I have 3 more. Are they even needed for doing the mountaineering route? I'll probably return via the main trail though....
I believe that anyone on the mountain is required to have a permit.
Also I went solo last year without a problem, but be aware that if you run into trouble you will need to rely on your self only. People near you may not be aware of your difficulty if they cannot see or hear you... Cell phones are useless except on top and getting assistance in a timely fashion is unlikely.
In short--know your limits and be smart about overreaching.