Yes that is what I had in mind. But I am uncertain about the steerer tube handling the bending moment that is normally exerted at the crown.
A look at the properties of carbon fibre composite tubes may provide some of the answer.
Wait. You mean that fork has a carbon steerer as well? I would be hesitant to do any type of spacer in that case. I had assume the fork has a cro-mo steerer, like most carbon forks.