"My position is that one can not filter and duplicate a true panchromatic material from an orthochromatic material.
Thus I stand with my earlier position that removal of something does not equate to the creation or the addition of something that is not present as an emulsion characteristic.
I don't think that anyone would argue with that, or with the general principle that filters cannot add spectral sensitivity to a film.
"One can not duplicate an orthochromatic emulsion or in any way come close to it by filtering a panchromatic film.'
Going from panchro to ortho doesn't involve the addition of any sensitivity - it only involves subtraction. Filtering a pan film with a cyan filter may not exactly recreate the characteristics of ortho film, but it will come close.