I have a hand crank I picked up that so far does not fit anything I have - but it does have the side to side holes like you show - instead of the top/bottom like most of them have. It's got an interesting offset too, but I can't tell by the pictures if yours has that.
It is not exactly like that one, but it may fit. Can you send me some detailed measurements so I can compare it?
My plan was to mount it so I could use it as a sort of "universal" handcrank that would mount to the special bases I'm making, and not on the machine. Because of that, one hand crank will be as good as another for my needs.