Based on existing photographic evidence, I think it is fairly safe to attribute these swords to Southern Yemen. As for where the scabbards were manufactured, I will defer this to other form members - we have experts in Indian arms and their decorative art. As you point out, there were certainly enough highly skilled silversmiths in Yemen during the 19th century, who produced beautiful jambiya scabbards and various jewelry, and who certainly had the ability to produced sword scabbards as well.
Interestingly enough, Elgood does not mention much about the blades and their origin. They are invariably slightly curved, with a single fuller and relatively short. Unlike Maghrebi or Zanzibari/Omani nimcha hilted swords, which have a wide variety of blade shapes and lengths, these seem to follow a pattern.
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