Thanks for the input! We will not add the fork and will rather try to sell it.
We are tempted with loading the bike on a regular hitch rack but, living in Los Angeles, traffic is crazy (where we live there are narrow roads with cars parked on both sides) and apparently it is CA law that a bike on a hitch may not extend past the side mirrors. For us not to go past the mirrors we will need to remove both wheels and that will give us a 1 inch (in total) wiggle room. Our C'dale XL/M frame is bloody long!
I called draftmaster and they are too expensive (around $600). So it's down to roofrack or taking chance on hitch rack...