I don't think it would be a problem using light loads. The overshot cards is basically a lightweight thin piece of cardboard or thick paper. Circle Fly overshot cards are .025" thick to just hold the shot while you roll crimp the shell. With your method, I bet you could get away of using just two pieces instead of four.
Why not just buy the overshot from Circle Fly? 500 for $5 bucks and you can spend more time shooting your Parker than making all those overshot cards by hand.
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