You want to do a KITH.
Invite those you want to participate, then have them invite others who they want to participate. Keep everyone on the same page as to expectations.
Bam! you have your KITH and only those who meet your criteria involved.
It is really as simple as that.
This.
A curated KITH is really the only way to establish a baseline of talent, where everybody gets a fair exchange. However, organizing something like that, may be tricky. It takes someone with a pretty advanced skill level, and an objective eye, who's opinion on quality isn't dominated by their tastes. It's why there are only a handful of ABS judges, and every year someone fails JS or MS (usually multiples) where some other JS or MS they're friends with assured them, they were gonna pass with flying colors, based on their opinions about what the test criteria should be, versus what it actually is.
Or some maker who's "hot shit" from a "style" perspective, will fail, because while they may be blowing people's minds with their style, they lack the fundamentals of fit, finish, and accuracy, which are the only real criteria for passing. Of course, even the judges, will feel differently, and know they're influenced by taste, no matter how hard they try not to be, which is why you've got multiple judges, and a majority vote to pass.
Even still, every year, they get ridiculed for "not being fair", or being "irrelevant" because this or that guy with a vocal customer base, feels their favorite maker was wronged, which he didn't pass because of his sheer "awesomeness". Or people who've handled other JS knives, and think "Oh I can make a knife as good or better", that fail, because they don't understand that a knife can be dog ugly and still pass, as long as it meets the fundamental criteria for construction quality.
However, I guess JT is saying "advanced construction techniques" versus "advanced skill/quality level", which is a different thing of course. Although, still tricky, I think he's simply saying "you know if you're a beginner, so stay out, otherwise, make something more complicated than usual, and do your best work".
Personally, I'd join a curated "advanced skill maker" KITH (tentatively, pending a list), but once you get to a certain level, it's not that hard to get almost any maker you respect, to be willing to do a knife-exchange with you. I've got probably half a dozen pending such trades with makers I personally consider, "top tier", and I've only ever had one or two people refuse, simply because of time constraints.
I do think a curated top level KITH could work, but that would probably have to be organized outside of the forums, most of the top level makers either lost interest, or got run off the forums, years ago. Blade would be the most likely place to organize such a thing, and you'd need someone to run it that is friends with a lot of makers, but preferably, moves between the different circles, if you want any variety. Lets be honest, we have some pretty large primary, and sub-groups of makers, that are each pretty insular in their own ways.