I have one and love it. I've actually thought of using it for this
very purpose. I don't think the plates come in 4mm thickness, though.
If they do, it's a terrific tool to use for this. The edges might get
a little muddy, though, and not stay sharp-walled top to bottom.
Might work, though. I'm not sure of their website. But they have it
in the Rio catalog, I believe.