I think that would do it, I will look into it. I figured all cups were about the same size & so I didn't consider replacing them. The Kurt Kinetic NDS cups appear to be much smaller. I will see if there's a way I could install something like that on my trainer.

Here's a picture that shows the flange:


I am using the skewer that came with the trainer (although it's not the one shown in the picture, because it's currently on my dedicated trainer bike).