I actually did this with a Nikon MF macro lens. I had to get the K-mount off of a donor M50/2 lens and run it through a lathe to get it down to the right size to fit on the Nikkor. Then I had to drill out holes because the set-screw locations on the Nikkor didn't match those on the K-mount.
I also had to change the aperature ring because the Nikkor was the type that the aperature ring had an exterior connection to the camera that interfered so it had to be removed.
The end result is a K-mount Nikkor macro lens. It won't focus to infinity but it'll focus even closer than it's supposed to on the near end!! Also the aperature ring has no detents to keep it in a certain stop.... so you have to be careful when setting it.
My suggestion is that if the lens is worth any money at all as it is, then sell it because it's value will be absolutely nothing once you modify it. But if it's of nominal value anyway (as my old Nikkor was) then cut, grind, drill and hack away!!
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