I can send you a model M if your Apples can handle a real PS/2
keyboard. That is the original buckling spring keyboard IBM gave
people who were moving from Selectrics.
I doubt it would work, even if a connector adapter could be found. The
key maps are different and without a way to remap them, you'd not get it
to work.
Apple won't let you remap a keyboard? I doubt the protocol is that
much different tho. Didn't we all steal it from Xerox or something?
A mouse and a keyboard use the same Com spec. The cable on a Model M
is plug in so it is easy to swap.