>>106195461
I see people recommend the CableMatters DP1.4 -> HDMI 2.1 adapter saying it works for 4K120 4:4:4, I have one on the way but I'm skeptical because as you said the bandwidth shouldn't be enough for that.
I just found this other one that should work in theory but nobody ever mentions it. guess I'll just order a bunch of different ones and return what doesn't work (maybe all of them)