RestorationAD, thats correct the fretboard is not slotted in order to preserve the integral structural strength of the so called "exoskeleton"
Actually Parker didn't use any sophisticated machinery for gluing frets. They just used a kind of mold or template made of silicon rubber where there were slots for fret positions. They put the frets into the mold/template slots, applied glue on the frets, placed fretboard over the template and fixed the whole thing with rubber bands. It looked pretty smart and easy way to glue the frets accurately. I try to find the video of the process.
As for removing tangs of ready made SS frets in order to produce the gluable frets, I am not so sure it can be easy and accurate. You cannot actually cut the tangs with cutting pliers - you need to grind the base of the frets really carefully and with tight tolerances. I think it will make more sense to use ordinary stainless wire and remove the excess by machining/grinding.