ssh -X replacement with NX protocol using nxproxy without using NX server

Doing ssh X11 forwarding through internet to my home is slow for me, so I come up with the following:

1. apt-get install nxproxy for both local and remote computer
   
2. Save the following dirty and ugly script as ssh-nx and put it in $HOME/bin or /usr/local/bin:
   


   
   #!/bin/bash
   #+1024 to make sure port can be opened by normal user, +4000 to make DISPLAY non-negative
   PORTNUM=$((RANDOM+5024)) #TODO makes sure the PORT is not bind by other process
   #DISPLAY and Listen Port differ by 4000 default
   RDISPLAY=$((PORTNUM-4000))
   HOSTNAME=$1
   PROGRAM=${2-\$SHELL -l}
   COOKIE=`xauth list ${DISPLAY-:0} | awk '{ print $2,$3  }'`
   COMMAND=\
   "nxproxy -C link=modem :$RDISPLAY  &>/dev/null &
   xauth add :$RDISPLAY $COOKIE;\
   DISPLAY=:$RDISPLAY $PROGRAM;\
   rm /tmp/.X11-unix/X$RDISPLAY;\
   xauth remove :$RDISPLAY"
   nxproxy -S localhost:$RDISPLAY &>/dev/null &
   ssh -t  -oExitOnForwardFailure=yes -L $PORTNUM:localhost:$PORTNUM $HOSTNAME $COMMAND
   #TODO kill nxproxy if ssh invoke failure (It do terminate automatically if connect to client nxproxy succesfully followed by connection termination)
   

   
   
   
3. replace "ssh -X" with "ssh-nx", such as following:
   

   username@localmachine:~$ ssh-nx username@remotemachine
   username@remotemachine:~$emacs foo.c
   
   

   or
   
username@localmachine:~$ ssh-nx username@remotemachine "emacs foo.c"