the op of this post just seems like a guy larping that he has a japanese wife.
i can say with confidence that the Japanese variant of the console is literally just the global version locked down to one localization. nintendo can sell it cheaper in japan because 1.) they don't have to export it, and 2.) they know the Japanese piracy scene it pretty nonexistent, and they are probably banking on recouping the costs in game sales.
now... if there's an exploit done with one variation (i.e., global), it's bound to be done to the other (jpn version) with the same entry points, that's just logical it's the same console you just can't choose the language of the device.
okay, honestly the word artifacts really made me cringe and made me stop lurking to say this. OP, do that shell swap and enjoy the device, I have a white shell coming for my moms switch2 it's gonna look sick... and by all means if you want to open the device and start debugging things, the scene would really appreciate that, because right now, it's pretty much a clean slate. realistically though the T239 chip has pretty beefy memory encryption, and without modifying that upon boot it's going to tell if the NAND has been tampered with... so hardware wise I think it's above your expertise to get us these "artifacts" (no offense)
there's no really public info or possibility of a full blown exploit anytime soon. switch2brew has lots of info you might find interesting, but the closest thing we have that I've seen is the day one webkit ROP chain, accessible by captive portal on the launch firmware (maybe newer ones too? idk if nintendo fixed the webkit that fast). while this is a start it doesn't do anything, as applications like the webkit are sandboxed and most likely encrypted memory wise. and with how small the kernels codebase is, a kernel exploit via software seems very unlikely for a long time.
finally, as far as "artifacts" go, what people meant by "widely" available, was what you referenced in your OP, not the fact that the console itself is widely available, but that teardown info is widely available. As
@TheStonedModder said, your vagueness really left potential commenters swinging in the dark.