I've literally been looking for a definitive anwser for almost 2 years. According to every retailer "fitment" calculator, and even according to most KW support reps, there is no KW coilover kit guaranteed to work (properly) with an F57, let alone the JCW.

For anyone still pulling their hair out, I got what seems to be a concrete answer today. The USA support guy got this directly from KW engineering in Germany.
It's the KW Street Comfort (AK the V2 Comfort, just to make things even more confusing) # 180200AU

I still feel uneasy about ordering something that even the KW website says is not compatible, but the source for this is adamant that this is the final word.
See the doc:

 

3-2026 UPDATE:


I now have the above KW's installed in my 2024 F57 JCW. Yes, they were designed for the F55, But KW said to use them, so...
They went in without any issues, have a large lowering range, and feel absolutely fantastic.