I'm not sure a lot of people in the U.S. have heard of Catlin, sadly. I have, mainly because when I was a kid I had a big book about Native Americans that included a lot of his work as illustrations.

I would love, love, love to see that play with Dench and Whishaw. I love Dench passionately, and while I'm not sure if I find Whishaw attractive, I'm pretty sure he is a good actor.