The firing pins are integral to the hammers.
If I were you, the easiest thing you can do to disable the gun and also be able to put it back is to remove the cocking hook from the barrel. Once the gun is dry fired, it will not be able to be cocked again until the hook is put back in. And it would not require you to open the action up.
A few other things could be done as well, but any of those would be more intrusive.
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B. Dudley
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