I have the camburg shackles on my GEN1 and
@MTF is correct, they do touch at full droop but it isn’t forceful even when off-roading. There is slight marring but nothing like the hitting that happens when the leafs hit the bumpstop on the frame when hard off-roading. I am not worried about the camburg shackles.
I have heard that the KHC work but haven’t confirmed.
I know a guy who went to Dirtking and they custom made him shackles that work with ICONs. Might want to contact them if they are willing to make one-off shackles for folks.