A conchologist I once met here (Siargao Island, Philippines) collected
chitons and popped each into a jar of glycerine/alcohol. Later, he taped
each between two microscope slide glasses to flatten them, and let them dry
out.

I think this might work with bivalves.

PS - I met him 10 years ago, so I can't really vouch for the long term
efficacy of the treatment.

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