I've already addressed this, the AI would still be entirely dependent on its appendages and that's a major advantage. So long as we watch the appendages and act to check any actions by them that seem suspicious then the AI would remain weak. The AI isn't magic, and it's not even beyond the scope of human cunning if we limit its input data. Again, also keep in mind also that we'd watch the communications between the appendages and the AI as well, so we'd know immediately if it was trying to get them to make it any tools. The Gatekeepers wouldn't exist in a vacuum, they would be watched over and countered by us.