Mmm... did you try it? :-P
Seems like a cron line is a good solution if we believe the following article (look at the end):
http://www.onlamp.com/pub/a/onlamp/2...29/netcat.html
Give it a try and if it does not work, we'll look at something else.
By the way, reverse telnet from work... it looks a bit insecure to me... are you sure you want/can do it?
Good luck,
G