I would assume it would require changing the Prime pipeline 2^512 along with Sha512 hashing as well as Sha512 Private key.
Remember, Gavin C.I.A.ndressen doesn't have a need to change bitcoin from sha256 they can't agree on anything other than cosmetic changes at this point.
Bitcoin uses Asic miners not 64 bit processors? Why not write the software to fit the hardware? and likely future hardware? AMD 128 Core Processors and 128 GB DDR5/6 RAM
Bitcoin should have never been written in sha256 other than as a selling to point for Gavin C.I.A.ndressen to his Comrades in C.hI.nA.
Quantum Computers are already here I don't want to bother your domain of coding and focus. But real work needs done without politics. Bitcoin is purely Political Invention. Wikileaks/Silk Road/FBI Honey Pots.
I already know this is a touchy subject because it pokes holes in too many conspiracies at once.