Totally agree with you. Keep in mind this is another example of the fact we musicians are a very tiny part of what people use PC's for so we get no love at all. Everything is done after the fact.
From what I've read, there is probably no problem with the keyboard working ok, most of what I've read about 64 bit problems involves software synths for sound but don't take my word for it.
Maybe you should buy just one setup, make sure it can be returned and test it out.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.