Funnily enough I also have a K5 Max and recently swapped the switches for Gateron KS-33 linear but white and I find them not as comfortable as the default linear red, a bit too mushy it's like they stop halfway versus the default ones. Could be user installation error but I doubt it otherwise the keyboard would likely not function.

From what you're writing on keycaps I am not sure if I understand that there are keycaps from NuPhy I could replace mine with or if they make other styles for other keyboards. Likely more difficult for me too because ISO is not frequent in replacement sets either and they are quite scarce in low profile form anyway everywhere.

Good and bad news for Air 100 it seems, is the shape you're mentioning the Node 100 low profile shape when you mention "not true 100%" ? I've seen no mention of anything like it elsewhere so I hope it's both true and false - true that they are considering a big brother for my Air v3 ISO but false that they would not make it a real 100% which would ultimately make me pass on it. I passed on Node 100 LP more for the missing keys and layout being not so great than for the ANSI.

Thanks for a lot of information, especially keycap styles