This all strikes me as much ado about nothing, at least in terms of scuba equipment DIY. There have long been workarounds — aftermarket sources for equipment; o-rings and other parts, from a dark period when just about all of the manufacturers were complete tools -- and the lion's share of techs, approved to work on their equipment, were fresh from an afternoon regulator repair seminar and stale doughnuts at a Sheraton.
As
@rsingler has already mentioned, much information has already been offered on this site -- a plethora of repair and diagnostic information; and aftermarket versions of service kits are already available, for a number of brands.
Rumor even has it, that
@rsingler is even offering classes.
During a move, some years back, with all of my tools in storage, and a serious lack of time, I had a couple of regulators serviced in San Francisco. The boneheads screwed up three times; tore two diaphragms -- made my first stage look like an over-sized Alka-Seltzer tablet; and also made a f**king leaf blower out of my FFM.
Even the DIY movement isn't really that new; Harlow offered decent sourcing information for a number of things, including fashioning one's own tools, as early as 1999 in
Scuba Regulator Maintenance and Repair — a definite relief from a period, when a number of us were basically cannibalizing older regulators from swap meets, for parts; when the pin-heads of Parkway, for example, who were then distributing Poseidon, made actual obtaining service kits a near impossibility . . .