BK, there are recordings and a DVD of two other Saint-Saens operas. The OP Henry VIII recording is outrageously expensive on Amazon, but you might find it in another country if you wish to pursue it. I've known about the DVD for some time, and it's been on my wish list.
I know nothing about his Renaissance courtesan opera Proserpine, but I'm curious. I plan to download a vocal score and examine it.
I don't know his Requiem, but I am quite fond of his Christmas Oratorio.