I've been pushing for "proof testing" for some time.
I think the proof tester should have the highest status job in the shop, and good pay. He should be responsible to see that only trustworthy blades are sent to customers, and that they represent the best Nepal has to offer. The mark of the proof tester on the blade is the assurance that it has been tested for quality. Proof testing might be a good job for one of the older master kamis who can no longer work at the forge.. Maybe he could use a lower paid strapping youth to do the actual impacts of the blades under his supervision.
The fact that 10 thousand blades have come through without failing does not mean proof testing is unnecessary. All it takes is a little water in the wrong place to harden the tang. The next blade could fail at a critical time for a customer, potentially damaging the customer, the reputation of BirGorkha, and the reputation of Nepal.