Jay, the regal is rotary, but not true inline rotary, the only way to be even close with that type of head is if the hook shank was in the middle of the jaws, as oposed to above as in a true inline.
Normand, that is exactly what I am planning to do with the jaws I have, all it needs is an arm with the right bend and a collar to take the head assembly and it's done, just need to fins someone with the knowhow and tools