I would really doubt the Nikormat FTN was modified. However the Nikomat (not Nikkormat) was made for the Japanese market so I suppose Nikon could have made a few with the AI mount for their market only. But I never heard of one. I just want to be sure the OP knows the difference between the AI and pre-AI mount. I posted a photo showing the two mounts a few months ago. But I can't find it now. Still looking. I don't want anybody to break their camera.
And to correct the op, the Nikomat normally has the F mount (original Nikon mount) and the D7000 an AI mount even though all the info says F mount.