Nice that you are still around Maedhros!
One last and nearly desparate idea would be to insert an note at Húrins death that with him the Dragon-helm disapeared. In that way we could make clear that Húrin got the Helm but we could let the way in which this happened completly unmentioned. Thus the core-idea of the note that Húrin got the Dragon-helm back would be kept.
Respectfully
Findegil
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