Just a thought, but could you cut the die from chip board and use the negative as a shim? Maybe that way it would only put pressure on the outside cut edge? You would probably have to play with the tabs on your platform and add a further shim, but it might work.
Or if that doesn't give you enough pressure right over the cut line, maybe trace around the die on chipboard and hand cut just inside the line to make a shim. If it works and you are making a few, it might be worth the time. I hope that makes sense.
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