I'm a huge fan of Orville Peck and he is one of the few names that would absolutely get me to return to this production, but, yeah, he's not a big name overall.
FWIW, though, prior to adopting the persona of Orville Peck, he worked professionally as a stage actor. I'd certainly be curious to see him return to that. And he'd certainly bring a much different sound to the role. As for the mask- he's switched to a smaller mask in recent years, perhaps he'll transition out of using it entirely. But it would fit for the Emcee, I suppose, particularly in this production where the Emcee is all facade anyway.
But we'll see if this pans out, particularly with Noblezada's commitment to Hadestown in London.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."