I'll be the oddball saying you are likely fine clamping to the fork with pclamps as long as you keep the pressure light. Most of the weight will be on the skewers/through axels which are designed to handle weight.
I recently cut up a carbon seatpost I that was slightly damaged by overtightening the seatclamp (or years of use and slight movement). I was surprised just how much effort it took to bend the post in half. I think I had to get to 1/4 of the diameter left before I could hear the crunching of carbon as I bent it. I believe at 1/8 I was able to break it by bending it in half. That is obviously not a scientific test and its comparing to a part meant to handle compression forces, but I think the worry over compressing a carbon fork is likely overblown. Forks are designed to handle a lot of forces, especially the torque of the lever arm (the fork) hitting the road. This in itself is a type of compressive force along the length of the fork.
i do wish more road bikes had rack eyelets though. best of luck.