Good news and bad news. I found a book called Traditional Storytelling Today: An International Sourcebook, which includes at least a few examples of Type 700. It mentions Solnicho and Piperko, or Sultanka and Piperko from Senovo, Ossenets, and also a variant of Type 700b from Senovo, known as Draganka. Draganka is a little girl who drowns in a pot of beans. This was recorded in 1990 by Milena Benofska.
Another version is included in Collection of Folklore, Science and Letters vol. 16-17 and a variant starring an anthropomorphic rat appears in Shapkarev's Sbornik ot Bulgarski narodni oumocvorenia, vol. 8.
Now if only I READ BULGARIAN
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Researching folktales and fairies, with a focus on common tale types.