I have an EK full cover block for my (founder's) 1080 w/ a backplate. The backplate will only be able to mount onto the PCB when the actual waterblock is installed. The screws pass down through the backplate, then straight through holes on the PCB and thread directly into the block. I'm 99% sure this is also the case for your EVGA FTW card.
However, if you're determined, I'm sure you could find some place online that'll make you a custom backplate to fit your color scheme. I know they are out there.