Stewart why do you have to change the tonneau t0 fit aero screens? Mine fits the same.
The cover fits right up to the inside of the windscreen with a very small gap
There are three fasteners just infront of the screen - one is certainly in the way and would have to come out, not sure on the other two as they might be to the side of the where the aero screen feet would be but not checked
The cover would have to be altered, cut back to accommodate the screen feet and the fastening altered