Ok, here's what I figured out so far....

I used 'alarmed' to run a script. The script is scheduled to run every 5 min between 8am and 6pm on weekdays (when I would typically be at work).

The script uses dbus commands to disconnect from the network, wait five seconds (required for disconnect to complete), then attempt to connect to the WPA Enterprise network.

This, unfortunately, is only a start. The script doesn't check to see if it is already connected to the Enterprise network, so it will perpetually disconnect and re-connect.

The script also doesn't check to see if the Enterprise network is available before attempting to switch to it.