I have the idea of a group that say it can "find quirks in those thought to be quirkless," but in reality teaches people random specific skills that can be passed off as quirks to people who don't know much about the field they're from.
Perfect pitch is something that people are born with and often lose if they don't use it when they're little. The few years after a kid is diagnosed quirkless most would still have it, and with a bit of coaching could identify any pitch they heard, and to mix it up some of them could use note values while others use frequencies or frequency ranges. Even if someone loses perfect pitch, relative pitch can be trained in anyone, and what most do is memorise one note and identify the interval, which can be used similarly, so it's not the end of the world if they don't practise and lose it.
They could do gymnastics and then say they had a hyper-flexability quirk, with maybe a minor or secondary balance quirk instead or as well, with caveats and drawbacks listed just happening to coincide.
Some cultures communicated space with cardinal direction, not having words for left, right, forwards or backwards. People can learn to track cardinal directions, and that could be pulled off as a mental compass quirk.
People often underestimate the accuracy of the human eye, and with practice in estimating angles and distance, one could produce a rather convincing triangulation quirk.
If in more urgent or less stringent cases, it seems reasonable to produce a series of relatively non-invasive dermal implants with various uses, to be put in convenient locations. Quirks are weird enough that a variety of explanations could be had if someone set off a metal detector or a electronic signal damaged it's function.
I'm sure there's tons of other things that I don't know because it's specific to something I've never learned, but that's exactly my point. There are so many specific skills most people just don't know about.
