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The D rings are NOT a requirement of the DOT certification, sorry. The requirement is for a retention system that meets certain standards. Most companies use the D rings system because it's cheap, and proven. AGV and Nolan both have helmets that use that same quick release system, which is metal, not plastic, in addition to another company that makes quick release buckles that can be added into a D-ring system.
Part of the DOT requirements for a helmet include listing the actual manufacturer of the helmet on the liner tag. You can look that manufacturer up in the various NHTSA helmet testing reports to see if it was ever tested and what the results were.
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