You should mount a plexy plate with a scharnier to the die cutting tool. Mark the place of the cutting edges on the plexyglas. (You can do it withslightly pressing the plexy to the tool in your die cutting machine as well)
Place the shhet you want to cut on the tool and fold the plexyglas sheet on and position the sheet in the required position.
Fold off the plexy from the tool and place a cutting plate on it.
After this you can use your Paperfox cylinder die cutter in the usual way.