Jackie,
First, let me say that I dont have any experience with polymer clay, although I have seen and read about people using it in pasta rolling machines.
I have two concerns about running it through a pasta roller:
1. You will only be able to do it a couple of times before the silicone tears.
OR
2. It will be too hard to go through the pasta roller.
Can you do this with metal plates?? (like embossing metal through a rolling mill)