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I let the melted paracord cool and harden before pulling it back into the connector halves. The mushrooms keep the cord ends from popping out.
The last step was to join the connector and yank-test it a few times. It works.
Although my original fused joint served as a reliable breakaway, I present this (arguably less elegant) alternative for those who'd rather go with an off-the-shelf solution. Without a doubt, the plastic connector is a much better (and much safer) choice for kids who are just learning how to work with paracord.
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Re-sheathing the Little Creek
Update: Little Creek necker
Links
Lighthound
Bark River Little Creek (@KnifeForums)
Bark River Little Creek (@KSF)