Chroma caps / faders on A&H Xone K2
Will it work?
The faders would get in each others way, most likely because they’re so closely spaced. And in terms of the knobs, I dunno why you’d bother replacing em. From what I’ve heard, the K2 knobs are -really- nice.
It works kind of
well i found a picture of chroma caps on a xone k2
but they look as if they would sit a little too high. The faders dont work, because the chroma faders just dont fit.
And like you said, the k2 knobs are VERY nice (same as xone 92 eq knobs), so the only reason why you’d want to do it is style, andf thats personal taste 
regards
As you can see in the pic above, they sit too high and there is no fix for it. This is caused mainly by the nut keeping the stem in place and an extra long shaft, it translates to all Xone gear with this kind of knob design.
I can also confirm that the faders don’t have enough room to be replaced and will bump into each other.