I think your problem is that Curses is going to write to STDOUT, so reopen that descriptor rather than opening a new one. If you need the original one save it beforehand.

open( SAVEOUT, ">&STDOUT" ) or die "Can't dup STDOUT: $!\n";
open( STDOUT, ">", "/dev/tty9" ) or die "Can't reopen STDOUT on tty9: 
+$!\n";
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