If he did the crime for which he is in jail he has no 'right' to be allowed to create a child. (they can't actually have s3x with their wives, yeah?) so no I dont believe he should be allowed any exceptions to the fact he's serving a life sentence for murder.
If he is innocent of murder I hope this comes to light in his retrial. But once someone is actually in prison he can hardly be consider 'innocent until proven guilty... Again...'
As for his wives right to try to have a baby - IMO there's nothing anyone but herself has done to prevent her from having a baby. She has as much right as anyone else to do with her body as she wishes. Be it TTC naturally, through a donor or IVF. I don't see her rights as being violated unless a law is passed to say a woman cannot conceive a child not of her husbands making. She's made a choice. The law shouldn't have to bend to suit her wants.
Although - if they do allow conjugal visits and she happens to fall pregnant then lucky them. My opinion on whether it's a particularly good or healthy idea aside, if they can fall pregnant within the existing system then they have a right to have that child.