To keep things in perspective, the practice of in-house DARs and others has worked fine for many long decades. Boeing and most other manufacturers have been up front and honest, and the FAA keeps a close eye and responds accordingly. It has been a practical system for many years. I'm just guessing that Bell has a similar system in place.
In this case Boeing cheated and the FAA failed to catch it. IMO the solution is to prosecute the individuals who cheated, and hopefully it won't happen again.
A larger FAA is not necessarily the answer.