You may be overthinking this. Huasteco indios are a tribe in and around the state of Hidalgo, Vera Cruz and etc in Méjico. Many localities have landrace chiles which they sell as unique and different that the usual serranos, but I see and purchase them in mercados and they are quite similar to other serranos.
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You are not likely to get Huastecan landrace seeds unless you go to a local mercado. The campesinos are not in the seed business, they grow and sell chiles.