Yes, you can cut rubbing plates apart quite easily. A while back, I was doing some mono-printing with a gelatin plate and had trouble with the edges of a rubbing plate making marks where I didn’t want them. I simply trimmed the edges off and had much better results.
You can cut a rubbing plate into multiple pieces with a standard pair of scissors. You can always lay the pieces on a sticky mat (Grip-n-Grip mat) next to each other if you want to make a rubbing from the entire image.
