Except he should have named his brother Shapour Gholam Reza and his decendents for instance instead of the incompetent and treacherous RP 

Could His Majesty legally do it? AryaMehr the Great never wanted to violate the "Constitution", and never did. :)))

Gholamreza was a dopey piece of nobody whose deep-seated corruption was partly responsible for Shah's unpopularity and ultimate downfall.

Shahnaz would have been the right choice.