No, don't take that up the octave. I've heard precisely one player play that high: Ian Bousfield.
https://youtu.be/rkzCm0aODlE
There's a C at 5:39. And that's not written, he just wanted to play that high.
No, don't take that up the octave. I've heard precisely one player play that high: Ian Bousfield.