Again, you should be fine with the Defenders. But modern design AT tires do not really sacrifice road performance, at least nothing that a BoF vehicle will feel. The GX is a lot better than the TRD 4Runner on road, but you won't be cornering as in an Audi or a Subaru anyway.
So all the tires mentioned above will do. If you want a tire specifically designed to do well in rain, consider the Continental Terrain Contact AT. They also track extremely well on dirt. But they are not as strong as the Wildpeak; there is no way I take a Conti AT where I take the Wildpeaks. They lack any real shoulder protectors and they also lack any biting edges for the loose stuff.
That aside, you are missing a couple points:
First, in general, brand name for tires is just that, a brand name. Here is a 65-page AAA tire study telling you that much:
https://www.aaa.com/AAA/common/AAR/files/Tire-Study-Report.pdf
I will agree about Michelin vs a minor/new/unproved brand. But to say that Goodyear or BFG is somehow better than Toyo, Nitto, or Falken is just brand obsession. These are actual brands, not some unproven startups.
Second, Sumitomo, in particular, is the world's 5th largest tiremaker. It is not a marginal, small, or second-class company. Wildpeak AT3W and MT are the tires offered on the new Jeep Gladiator Rubicon trim. If that's not a good enough endorsement from the industry itself, I don't know what is. Sure, the Wildpeaks are made in Thailand.
Third, the tires you have in mind DO NOT have kevlar in the sidewalls. The P-metric version has some kevlar in the tread and the LT version has more. You need to go to MT-R to get Kevlar in the sidewalls. The GY MT-R is actually the tire I wanted when I was looking for a trail rig before deciding to buy a new 4Runner instead. You keep citing those reviews you found, but you can bet they are about the LT versions. If you want to talk LT tires that's different. I have been talking P metric in this thread. And for that, I am a better resource that what you have linked, lol.
At the end, any of the tires mentioned in this thread will do the job for you. Maybe just get those Defenders and call it a day. I go through tires in 2 years or less so for me getting it perfectly right the first time around is not as big of a deal as if I were wearing a set over 5-6 years.