Argh! I know I'm crazy when I continually contradict my own email messages.

cpu does its own newns so giving a -n namespace to aux/listen won't work.
However, you could do the appropriate binds in the cpu case of your profile
to see whatever namespace you'ld like:

switch($service){
case terminal
	...
case cpu
	bind -a /mnt/term/mnt/wsys /dev
	bind /mnt/term/dev/cons /dev/cons
	bind /mnt/term/dev/consctl /dev/consctl
	bind -a /mnt/term/dev /dev
	srv fileserver
	mount /srv/fileserver /n/fileserver
	bind /n/fileserver/usr /usr
	bind /n/fileserver/sys /sys
	...
}

None of this will result in a direct connection from the machine you run
drawterm on to the fileserver.  It'll always be filtered through cpu.