Elderling Creations Theory (Spoilers through all the books and Dragon Haven)

[Farseer]

Could this then possibly suggest that the person who created Kennit's charm may have been a hedge-witch as well, with the charm keyed to him? Or was the charm not keyed to him, just simply carved in his likeness?

In Chapter One of SOM it says, "The carver had needed absolute silence for his concentration, for he worked not only wood but a spell that would bind the charm to protect the wearer from enchantments."

In this, it was most likely a hedge-witch who did the carving and it possibly also suggests that the charm finally quickened when it did because that was when it was first required to protect Kennit from the enchantment of the Others' path (which happens later in the chapter). After all, this is the very reason why Kennit had the charm made in the first place...so he could finally go in safety to Others' Island.

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Oops, I forgot to add that the charm was anchored by a "double thong of black leather" to Kennit's wrist so that, by its piercings at its brow and jaw, it "snugged firmly against his wrist, exactly over his pulse point."

Possibly this positioning over his pulse point was also significant in either/both of the binding or quickening process?