Magnus, I was going to say, “Yes, but I don't like it,” but then I thought of all the other characters who were played by more than one person, and decided I don't want to open that door. So I'm vetoing your recasting of John Karlen as First Willie, and recasting him instead as the cute little black nurse in episode 563.
The cute little black nurse was played by Beverly Atkinson. Wikipedia, citing the New York Times, says she was “known for her character work playing women down-on-their-luck or caught up in drug addiction.” Interesting, giving that my own comment on her in 2008 was:
It's a pity Julia never saw her efficient way with sedatives; Julia would have hired her as an assistant immediately.
Anyway, who would care to recast her?