PJ, after our discussion on skype today, I spent a little more time thinking about your idea of the GCP and the Apprentice League.
As we all know a lot of enthusiasts are interested in subzero in general but don't want to post scores because of stepping up in the league. I think the Apprentice League would just shift the problem to a different league but wouldn't solve the problem.
What about allowing a certain amount of subzero submissions in the enthusiasts league which are time limited. So e.g. allow up to 3 active subzero submissions which expire after 30 days (disable points after 30 days).
This way the enthusiasts could try subzero and still stay in the enthusiasts league. If they want permanent subzero submissions they have to move up to extreme league.