If you have access to the entire file system put a script in /etc/cron.hourly
that launches ssh.
In my case I had to hack around until I managed to open a shell listening on
some port. (I wrote a tcl script that used the exec command. I can't remember
exactly how I did it now.)
My solution is to have 2 ssh listeners on different ports. The 2nd sshd is
there in case something happens to the first one or I have to restart it.