Separate the one who teaches from the one who tests, pay the examiner the same whether you pass or fail, record everything and allow appeals, let anyone check the result, and make it update every time it runs.
A second door is only worth building if it can't be bought or bent the way the first one was. So follow the money through the new system before you trust it. Anyone who sells the training has a reason to pass their own students. An examiner paid more for passing lets standards slide, and one paid more for failing robs candidates. A credential in a public registry is harder to fake than paper in a frame.
Checklist. Does the tester sell the training? Is examiner pay the same for pass and fail? Is every exam recorded? Can a candidate appeal to a different examiner? Can anyone look up the result? Do the topics and examiner ratings update with real outcomes?
Maxwell Rich Certification, the author's own version of this, is new and has no track record yet. Judge it by its design.
In Four Weeks, Not Four Years: Chapters 9, 10.