Rakovsky
Oud Fan
Matt,I have been following this post and have become curious myself, so I did some searching.
In modern times, seashells seem to be considered inanimate objects such as rocks or sticks so, safe to walk on the beach.
The Gemera states that "only items one may eat may be used for the work of heaven".
I read many other items of pertinence here:
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Onycha - Wikipedia
en.m.wikipedia.org
The Torah bans eating blood, hence Orthodox Judaism carefully removes the blood from meat. However, de facto some miniscule amount of blood would naturally remain. My conclusion is that cleaning is considered to make the food clean.
In the case of seashells on the beach, the soft animal part is no longer typically in them. In the case of the seashell flaps, they also undergo a cleaning process with Carshinah Lye. Carshinah is most often translated as the grassy "Bitter Vetch" plant.
After trying to work out the meaning of Carshinah Lye, I wondered if "Shekheleth" could refer to Opercula after they have been cleansed with Carshinah lye from grassy plants as the Talmud prescribes. That could explain why the name Shekheleth resembles Shekhaliim (peppergrass).
I made a thread trying to unravel the meaning of Carshinah Lye here and am interested in your thoughts: https://www.ouddict.com/threads/what-was-karshinah-lye-can-you-get-it-today.9381/