Web server with Telnet Functionality?

Has anyone used a telnet emulator that runs as or on a web server?  I'm not
looking for an embedded telnet (port 23) client, but rather a telnet
connectivity tool that looks and smells to the client like a web page.  Work
Station Gateway is one example, but that won't work for my purposes because
of the rotating port number problem (moving target).  I need something that
runs on Port 80 or Port 81.  I want to be able to sit at any Internet
Explorer session that's connected to the internet and pull up a telnet
session to my as/400 using only port 80 and HTTP as connectivity.  Basically
I need some way to get in without port 23.

WSG is a good start, but it requires ports other than 80 to work, and these
typically don't survive the trip through a firewall.  Often times, client
(customer) firewalls block telnet access to the outside world.

Has anyone used iSeries Web Access?  I know that it has a telnet style
component, but will it work for this purpose?  Does it use flaky ports like
WSG?

Any ideas?

Thanks.