I think our resident Tenkara-sama, C.M. Stewart ties his Tups with plover on occasion, using that same materials list as the basis for his interpretation. For myself, the question as to how much you can change on a fly and still legitimately label it, say, a "Tups" or a "Watchet" is kind of like the famous "Theseus' paradox" that first appears in Plutarch: the Athenians it seems still have the ship of the famous hero on display, but as they take your money and hand you your ticket stub, they perhaps neglect to tell you that every board, every hawser and square foot of sail has been replaced as it rotted away over the centuries.The dark hackle may be a disastrous
Is it still the "Ship of Theseus?" If not, at what point did it stop being such? For myself, the labeliing of any "traditional" pattern tied with modern methods and using modern materials should begin with implied "scare quotes"...and hopefully applied with a bit of humility and a sense of humor. 
(FWIW, for those of y'all into antiques, I'll give you a great deal on the very ax that Abraham Lincoln used to split all those rails; it's like new--the handle replaced three times over the years, the head, only twice,
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Purrrfekt...