Holy mother of God, nonny, are you me?! I was toying with the idea all very long, trying to imagine circumstances in which Bertie and Newt might meet (and how Jeeves would react to the creature. Possibly feed the Niffler every pair of Bertie's cufflinks he disapproves of!)
Re: Crossover with P.G. Wodehouse (gen or any pairing)
Meaning, very much seconded!!!