It’s been done at least twice with a CF base. I just don’t have pictures and can’t find the threads where it has been mentioned. It can be done. But you’ll need to use some engineering smarts to come up with a design that is strong and robust.
Also take a look at this thread for ideas. It includes good pictures of the Scott Wallis CF base.
You could also rig up something similar to the KH adapter pictured there. Weld or epoxy a half cylinder to a KH 4 bolt plate. Rig up some way of attach and adjust the two adjusting bolts on the seatpost. I’d follow that route. Something where you use the KH 4 bolt plate and the standard 4 bolt holes. That will be stronger and also allow you to switch over the KH rails adapter if necessary or other compatible seatpost mount options that may come in the future.
The bigger advantage of going rail-less is that you won’t have to worry about your fingers getting caught under or between the rails. More friendly for trials and street style riding.