Stuff like virtualization features and Hyperthreading are responsible for such a tiny fraction of extra die area and so deeply entwined with critical functional

Stuff like virtualization features and Hyperthreading are responsible for such a tiny fraction of extra die area and so deeply entwined with critical functionality that it's extremely unlikely for a given part to need to be binned on the basis of whether that feature works or not. Intel would never amass enough broken-HT but otherwise good chips to provide the impetus for an extra SKU.