The reports are true, but (1) are the Paks going to be grateful to the point of getting into the BIG MESS and (2) Paks have a lot of deals with Russians now, including buying military hardware. .. so -- we do not know which way they will swing.
And Israel is also an uncertain factor... hopefully they are smart enough to stay out.
Good question and probably one the Paks are asking themselves. I would think Pakistan will supply SA with nukes - if SA asks for them, if not the crews, or at least onsite advisers.