Yes, manakoAT made an NUB extractor, but bxaimc posted about it in a new thread here. I had a little difficulty finding it myself, since the post doesn't contain "nub extractor" in it. I searched by author, and that doesn't have a "skip to end" feature either. Anyway, that might be the tool you're looking for. Hope it helps. Mouser X over and out.
IS14/BNSF is already added to vgmstream but it's disabled atm because we're having difficulty with MSVC in compiling the source. Until then, it's still unplayable. BTW, it uses the Siren14 speech codec which is also Polycom's G 722.1C codec.