Hey tyriax,
I am currently dealing w/ checkpoint fde for our Win7 to Win10 refreshes. I'll be sure to reply back here when/if I figure something out.
By the way, checkpoint has a script for in-place upgrades from Win 7 to Win 10. https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk106433&partition=General&product=FDE
Obviously not for wipe n loads but I think it might be useful in figuring something out as the script seems to add the filter drivers to WinPE/install media