Please elaborate: What are the benefits of a Gatekeeper? How could you get them without one?
If you would want to have a gatekeeper at all, but definitely don't want to let the AI out, I would think that the benefits of having one would be to permit communication with the AI to draw upon its superhuman intelligence. If you can use the setup you just described, you could skip the step of ever using gatekeepers who actually have the power to let the AI out.
Update 2013-09-05.
I have since played two more AI box experiments after this one, winning both.
Update 2013-12-30:
I have lost two more AI box experiments, and won two more. Current Record is 3 Wins, 3 Losses.