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Slightly OT but ...
Most of the parts in a service kits are o-rings. They can be properly sourced and will work which is why the cost of the service kits gravels many people (the availability issue aside). But things like HP / LP seats are typically specific to the reg mfg. So you are kinda stuck in most but not all cases.
I too have wondered about the mfg reg repair "courses" offered at DEMA. They seem a bit quick. Especially, when it comes to other industry courses like cylinder inspection courses that last all day. But after that they are a certified tech for that mfg. I learned everything I know from Pete and Vance . And in servicing regs that I bought used I have seen some oddities that lets say would not meet specs.
To answer the OP's question. If you are comfortable with the non-authorized route and do not need parts like seats I would say go for it. He may well have more experience than the "authorized" tech.
I think that the one day service courses offered at DEMA are designed for the technician that already is a service technician. My ScubaPro course a million years ago took a full day, and all that was covered was the 2, 10, 10+, 15, and 20 first stages, and the 190, 200, 250, and D400 seconds. My Atomic course was 4 hours, but it was the first year Dean offered it, and it was the T1, no x's, no B, Z, or M. I think we all noted that the Ti bore a striking resemblance to a Mk20. I don't think that a reg technician course is or should be designed to make you a regulator repair specialist. It's designed to give you hands on experience with a particular manufacturers equipment, and to tick off a liability box. You are expected to come into the course already a regulator repair guru.
Of course, the way the scuba industry has gotten, my cat could take the course and folks would expect her to be a reg guru right out of the box.