I could go on about the reasons a stick is superior......
Unless he's REALLY attached to the pickup (like, he got it for free), he'd be better off to trade it off or sell it. But, he should be able to get a flywheel, adaptor, clutch, transmission, etc from one of the TDR vendors. I looked into it about 4 years ago for the one Mom now has, and it would have been about $2500 for the conversion, not to mention the little parts needed- pedals, clutch master cylinder, clave, etc, etc.
He can reuse the NP205 T-case.
He'll need to get the driveshadt lengthened and rebalanced.
Different transmission supports, maybe.
Daniel