x-only trick from One Thing Well (http://onethingwell.org/post/1432068153/x-only)

xonly

#!/bin/bash

# Did a program get specified?
if test $# -lt 1; then
    echo "You must specify a program to run with x.";
    exit;
fi

# Did a tty get specified?
if test $# -lt 2; then
    tty=1;
else
    tty=$2;
fi

# If a tty was specified, is it legit?
if test $tty -gt 6; then
    echo "Cannot use a tty higher than 6.";
    exit;
fi

# And finally, xinit.
xinit $1 -- :$tty