I've recently thought you could sell a product that gives accuracy tests to certify power meters. For example, in Zwift Racing you bring in your trainer to be certified accurate and it picks up that SSN (which I'm not even sure exists) and Zwift knows its accurate power. For 'Championships' that and a weigh in the week of the race would be required, almost like a test proctor.
You could probably do it with an SRM and a pedal PM to compare the 3, but there would have to be a standard or people would argue the results.