As for the different fingerings, they are in part due to the obviously different action and keyboard feelings in piano and in harpsichord. Equally important, if not more, is for articulation and phrasing. For example, I attach here the first page of K1 as fingered by a renown harpsichordist and writer, Claudio DiVeroli. My own fingering is still different in many spots.John Ruggero wrote: ↑19 Jun 2021, 19:41 If you think that the fingering would differ so extensively for harpsichord and piano, I would vote for three versions, then, one unfingered, one prepared by an expert harpsichordist and one by an expert pianist, musicians who have performed the sonatas extensively.
So, I think your idea of preparing three different versions - unfingered, with piano fingering and harpsichord fingering, is a very sensible one (though I am still sure most harpsichordists would choose the unfingered version).